src/patch/patches/osr_fling_2745.patch

diff --git content/browser/renderer_host/input/fling_scheduler.cc content/browser/renderer_host/input/fling_scheduler.cc
index 431df5d50debe..0fcc9ea8fbb1a 100644
--- content/browser/renderer_host/input/fling_scheduler.cc
+++ content/browser/renderer_host/input/fling_scheduler.cc
@@ -68,6 +68,9 @@ void FlingScheduler::ProgressFlingOnBeginFrameIfneeded(
 }
 
 ui::Compositor* FlingScheduler::GetCompositor() {
+  if (compositor_) {
+    return compositor_;
+  }
   if (!host_->GetView()) {
     return nullptr;
   }
diff --git content/browser/renderer_host/input/fling_scheduler_base.h content/browser/renderer_host/input/fling_scheduler_base.h
index afefe3cd83dee..6668463247644 100644
--- content/browser/renderer_host/input/fling_scheduler_base.h
+++ content/browser/renderer_host/input/fling_scheduler_base.h
@@ -7,12 +7,23 @@
 
 #include "content/browser/renderer_host/input/fling_controller.h"
 
+namespace ui {
+class Compositor;
+}
+
 namespace content {
 
 class FlingSchedulerBase : public FlingControllerSchedulerClient {
  public:
   virtual void ProgressFlingOnBeginFrameIfneeded(
       base::TimeTicks current_time) = 0;
+
+  void SetCompositor(ui::Compositor* compositor) {
+    compositor_ = compositor;
+  }
+
+protected:
+ ui::Compositor* compositor_ = nullptr;
 };
 
 }  // namespace content
diff --git content/browser/renderer_host/render_widget_host_impl.cc content/browser/renderer_host/render_widget_host_impl.cc
index d7b85d4a6adbe..6bd3035c313b3 100644
--- content/browser/renderer_host/render_widget_host_impl.cc
+++ content/browser/renderer_host/render_widget_host_impl.cc
@@ -3271,6 +3271,11 @@ void RenderWidgetHostImpl::OnInvalidInputEventSource() {
       GetProcess(), bad_message::INPUT_ROUTER_INVALID_EVENT_SOURCE);
 }
 
+void RenderWidgetHostImpl::SetCompositorForFlingScheduler(ui::Compositor* compositor)
+{
+  fling_scheduler_->SetCompositor(compositor);
+}
+
 void RenderWidgetHostImpl::AddPendingUserActivation(
     const WebInputEvent& event) {
   if ((base::FeatureList::IsEnabled(
diff --git content/browser/renderer_host/render_widget_host_impl.h content/browser/renderer_host/render_widget_host_impl.h
index 5c042eea04022..8752e45f39f1f 100644
--- content/browser/renderer_host/render_widget_host_impl.h
+++ content/browser/renderer_host/render_widget_host_impl.h
@@ -801,6 +801,7 @@ class CONTENT_EXPORT RenderWidgetHostImpl
 
   void ProgressFlingIfNeeded(base::TimeTicks current_time);
   void StopFling();
+  void SetCompositorForFlingScheduler(ui::Compositor* compositor);
 
   // The RenderWidgetHostImpl will keep showing the old page (for a while) after
   // navigation until the first frame of the new page arrives. This reduces