src/patch/patches/viz_osr_2575.patch

diff --git components/viz/host/host_display_client.cc components/viz/host/host_display_client.cc
index 3547ee865c22..2215296ffadc 100644
--- components/viz/host/host_display_client.cc
+++ components/viz/host/host_display_client.cc
@@ -43,9 +43,14 @@ void HostDisplayClient::OnDisplayReceivedCALayerParams(
 }
 #endif
 
-#if defined(OS_WIN)
+void HostDisplayClient::UseProxyOutputDevice(
+    UseProxyOutputDeviceCallback callback) {
+  std::move(callback).Run(false);
+}
+
 void HostDisplayClient::CreateLayeredWindowUpdater(
     mojo::PendingReceiver<mojom::LayeredWindowUpdater> receiver) {
+#if defined(OS_WIN)
   if (!NeedsToUseLayerWindow(widget_)) {
     DLOG(ERROR) << "HWND shouldn't be using a layered window";
     return;
@@ -53,8 +58,8 @@ void HostDisplayClient::CreateLayeredWindowUpdater(
 
   layered_window_updater_ =
       std::make_unique<LayeredWindowUpdaterImpl>(widget_, std::move(receiver));
-}
 #endif
+}
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 void HostDisplayClient::DidCompleteSwapWithNewSize(const gfx::Size& size) {
diff --git components/viz/host/host_display_client.h components/viz/host/host_display_client.h
index cedf833d2358..04456e045304 100644
--- components/viz/host/host_display_client.h
+++ components/viz/host/host_display_client.h
@@ -31,17 +31,17 @@ class VIZ_HOST_EXPORT HostDisplayClient : public mojom::DisplayClient {
   mojo::PendingRemote<mojom::DisplayClient> GetBoundRemote(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
 
- private:
+ protected:
   // mojom::DisplayClient implementation:
+  void UseProxyOutputDevice(UseProxyOutputDeviceCallback callback) override;
+
 #if defined(OS_MACOSX)
   void OnDisplayReceivedCALayerParams(
       const gfx::CALayerParams& ca_layer_params) override;
 #endif
 
-#if defined(OS_WIN)
   void CreateLayeredWindowUpdater(
       mojo::PendingReceiver<mojom::LayeredWindowUpdater> receiver) override;
-#endif
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   void DidCompleteSwapWithNewSize(const gfx::Size& size) override;
diff --git components/viz/host/layered_window_updater_impl.cc components/viz/host/layered_window_updater_impl.cc
index b04f654fe820..131977a36591 100644
--- components/viz/host/layered_window_updater_impl.cc
+++ components/viz/host/layered_window_updater_impl.cc
@@ -44,7 +44,7 @@ void LayeredWindowUpdaterImpl::OnAllocatedSharedMemory(
   // |region|'s handle will close when it goes out of scope.
 }
 
-void LayeredWindowUpdaterImpl::Draw(DrawCallback draw_callback) {
+void LayeredWindowUpdaterImpl::Draw(const gfx::Rect& damage_rect, DrawCallback draw_callback) {
   TRACE_EVENT0("viz", "LayeredWindowUpdaterImpl::Draw");
 
   if (!canvas_) {
diff --git components/viz/host/layered_window_updater_impl.h components/viz/host/layered_window_updater_impl.h
index 1026b739d283..fe562ab60ce9 100644
--- components/viz/host/layered_window_updater_impl.h
+++ components/viz/host/layered_window_updater_impl.h
@@ -35,7 +35,7 @@ class VIZ_HOST_EXPORT LayeredWindowUpdaterImpl
   // mojom::LayeredWindowUpdater implementation.
   void OnAllocatedSharedMemory(const gfx::Size& pixel_size,
                                base::UnsafeSharedMemoryRegion region) override;
-  void Draw(DrawCallback draw_callback) override;
+  void Draw(const gfx::Rect& damage_rect, DrawCallback draw_callback) override;
 
  private:
   const HWND hwnd_;
diff --git components/viz/service/BUILD.gn components/viz/service/BUILD.gn
index eb1a0ae5ca25..846c738053b7 100644
--- components/viz/service/BUILD.gn
+++ components/viz/service/BUILD.gn
@@ -13,7 +13,10 @@ config("viz_service_implementation") {
 }
 
 viz_component("service") {
+  never_build_jumbo = true
   sources = [
+    "//cef/libcef/browser/osr/software_output_device_proxy.cc",
+    "//cef/libcef/browser/osr/software_output_device_proxy.h",
     "display/bsp_tree.cc",
     "display/bsp_tree.h",
     "display/bsp_walk_action.cc",
diff --git components/viz/service/display_embedder/output_surface_provider_impl.cc components/viz/service/display_embedder/output_surface_provider_impl.cc
index b4d4b1c1c597..9ce685048ab1 100644
--- components/viz/service/display_embedder/output_surface_provider_impl.cc
+++ components/viz/service/display_embedder/output_surface_provider_impl.cc
@@ -13,6 +13,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/chromecast_buildflags.h"
 #include "cc/base/switches.h"
+#include "cef/libcef/browser/osr/software_output_device_proxy.h"
 #include "components/viz/common/display/renderer_settings.h"
 #include "components/viz/common/frame_sinks/begin_frame_source.h"
 #include "components/viz/service/display_embedder/gl_output_surface.h"
@@ -224,6 +225,20 @@ OutputSurfaceProviderImpl::CreateSoftwareOutputDeviceForPlatform(
   if (headless_)
     return std::make_unique<SoftwareOutputDevice>();
 
+  {
+    mojo::ScopedAllowSyncCallForTesting allow_sync;
+    DCHECK(display_client);
+    bool use_proxy_output_device = false;
+    if (display_client->UseProxyOutputDevice(&use_proxy_output_device) &&
+        use_proxy_output_device) {
+      mojom::LayeredWindowUpdaterPtr layered_window_updater;
+      display_client->CreateLayeredWindowUpdater(
+          mojo::MakeRequest(&layered_window_updater));
+      return std::make_unique<SoftwareOutputDeviceProxy>(
+          std::move(layered_window_updater));
+    }
+  }
+
 #if defined(OS_WIN)
   return CreateSoftwareOutputDeviceWin(surface_handle, &output_device_backing_,
                                        display_client);
diff --git components/viz/service/display_embedder/software_output_device_win.cc components/viz/service/display_embedder/software_output_device_win.cc
index 2bb30e5318b6..535535dd6c10 100644
--- components/viz/service/display_embedder/software_output_device_win.cc
+++ components/viz/service/display_embedder/software_output_device_win.cc
@@ -188,8 +188,9 @@ void SoftwareOutputDeviceWinProxy::EndPaintDelegated(
   if (!canvas_)
     return;
 
-  layered_window_updater_->Draw(base::BindOnce(
-      &SoftwareOutputDeviceWinProxy::DrawAck, base::Unretained(this)));
+  layered_window_updater_->Draw(
+      damage_rect, base::BindOnce(&SoftwareOutputDeviceWinProxy::DrawAck,
+                                  base::Unretained(this)));
   waiting_on_draw_ack_ = true;
 
   TRACE_EVENT_ASYNC_BEGIN0("viz", "SoftwareOutputDeviceWinProxy::Draw", this);
diff --git content/browser/compositor/viz_process_transport_factory.cc content/browser/compositor/viz_process_transport_factory.cc
index 8e10af98f2b0..d39fc7ec7b4c 100644
--- content/browser/compositor/viz_process_transport_factory.cc
+++ content/browser/compositor/viz_process_transport_factory.cc
@@ -404,8 +404,13 @@ void VizProcessTransportFactory::OnEstablishedGpuChannel(
   compositor_data.display_private.reset();
   root_params->display_private =
       compositor_data.display_private.BindNewEndpointAndPassReceiver();
-  compositor_data.display_client =
-      std::make_unique<HostDisplayClient>(compositor);
+  if (compositor->delegate()) {
+    compositor_data.display_client =
+        compositor->delegate()->CreateHostDisplayClient();
+  } else {
+    compositor_data.display_client =
+        std::make_unique<HostDisplayClient>(compositor);
+  }
   root_params->display_client =
       compositor_data.display_client->GetBoundRemote(resize_task_runner_);
 
diff --git mojo/public/cpp/bindings/sync_call_restrictions.h mojo/public/cpp/bindings/sync_call_restrictions.h
index 60e114920575..01f2ce164a3b 100644
--- mojo/public/cpp/bindings/sync_call_restrictions.h
+++ mojo/public/cpp/bindings/sync_call_restrictions.h
@@ -29,6 +29,7 @@ class Compositor;
 
 namespace viz {
 class HostFrameSinkManager;
+class GpuDisplayProvider;
 }
 
 namespace mojo {
@@ -82,6 +83,8 @@ class COMPONENT_EXPORT(MOJO_CPP_BINDINGS) SyncCallRestrictions {
   // For preventing frame swaps of wrong size during resize on Windows.
   // (https://crbug.com/811945)
   friend class ui::Compositor;
+  // For query of whether to use SoftwareOutputDevice or not.
+  friend class viz::GpuDisplayProvider;
   // END ALLOWED USAGE.
 
 #if ENABLE_SYNC_CALL_RESTRICTIONS
diff --git services/viz/privileged/mojom/compositing/display_private.mojom services/viz/privileged/mojom/compositing/display_private.mojom
index d36f62e6ee41..e8ec62cda569 100644
--- services/viz/privileged/mojom/compositing/display_private.mojom
+++ services/viz/privileged/mojom/compositing/display_private.mojom
@@ -74,12 +74,14 @@ interface DisplayPrivate {
 };
 
 interface DisplayClient {
+  [Sync]
+  UseProxyOutputDevice() => (bool success);
+
   [EnableIf=is_mac]
   OnDisplayReceivedCALayerParams(gfx.mojom.CALayerParams ca_layer_params);
 
   // Creates a LayeredWindowUpdater implementation to draw into a layered
   // window.
-  [EnableIf=is_win]
   CreateLayeredWindowUpdater(pending_receiver<LayeredWindowUpdater> receiver);
 
   // Notifies that a swap has occurred and provides information about the pixel
diff --git services/viz/privileged/mojom/compositing/layered_window_updater.mojom services/viz/privileged/mojom/compositing/layered_window_updater.mojom
index 6b7fbb6cf13d..e2af75168cb9 100644
--- services/viz/privileged/mojom/compositing/layered_window_updater.mojom
+++ services/viz/privileged/mojom/compositing/layered_window_updater.mojom
@@ -26,5 +26,5 @@ interface LayeredWindowUpdater {
   // Draws to the HWND by copying pixels from shared memory. Callback must be
   // called after draw operation is complete to signal shared memory can be
   // modified.
-  Draw() => ();
+  Draw(gfx.mojom.Rect damage_rect) => ();
 };
diff --git ui/compositor/compositor.h ui/compositor/compositor.h
index 3e2d2304faf7..f0029d34f591 100644
--- ui/compositor/compositor.h
+++ ui/compositor/compositor.h
@@ -23,7 +23,9 @@
 #include "cc/trees/layer_tree_host_single_thread_client.h"
 #include "components/viz/common/frame_sinks/begin_frame_args.h"
 #include "components/viz/common/surfaces/frame_sink_id.h"
+#include "components/viz/host/host_display_client.h"
 #include "components/viz/host/host_frame_sink_client.h"
+#include "components/viz/service/display/software_output_device.h"
 #include "mojo/public/cpp/bindings/pending_remote.h"
 #include "services/viz/privileged/mojom/compositing/vsync_parameter_observer.mojom-forward.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ -122,6 +124,14 @@ class COMPOSITOR_EXPORT ContextFactory {
   virtual viz::HostFrameSinkManager* GetHostFrameSinkManager() = 0;
 };
 
+class COMPOSITOR_EXPORT CompositorDelegate {
+ public:
+  virtual std::unique_ptr<viz::HostDisplayClient> CreateHostDisplayClient() = 0;
+
+ protected:
+  virtual ~CompositorDelegate() {}
+};
+
 // Compositor object to take care of GPU painting.
 // A Browser compositor object is responsible for generating the final
 // displayable form of pixels comprising a single widget's contents. It draws an
@@ -155,6 +165,9 @@ class COMPOSITOR_EXPORT Compositor : public cc::LayerTreeHostClient,
   // Schedules a redraw of the layer tree associated with this compositor.
   void ScheduleDraw();
 
+  CompositorDelegate* delegate() const { return delegate_; }
+  void SetDelegate(CompositorDelegate* delegate) { delegate_ = delegate; }
+
   // Sets the root of the layer tree drawn by this Compositor. The root layer
   // must have no parent. The compositor's root layer is reset if the root layer
   // is destroyed. NULL can be passed to reset the root layer, in which case the
@@ -390,6 +403,8 @@ class COMPOSITOR_EXPORT Compositor : public cc::LayerTreeHostClient,
 
   std::unique_ptr<PendingBeginFrameArgs> pending_begin_frame_args_;
 
+  CompositorDelegate* delegate_ = nullptr;
+
   // The root of the Layer tree drawn by this compositor.
   Layer* root_layer_ = nullptr;