WIP: Towards merging OffscreenCanvas and Mus code

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 92696ade86a16ef4b7811f318b7e6f13a05c43ab..e1e6554894354077d53a89edf39664edfd201824 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -48,6 +48,10 @@ class SurfaceManager;
 class TaskGraphRunner;
 }
 
+namespace display_compositor {
+class DisplayCompositor;
+}
+
 namespace gfx {
 class Rect;
 class ScrollOffset;
@@ -101,6 +105,10 @@ class COMPOSITOR_EXPORT ContextFactoryPrivate {
   // Gets the surface manager.
   virtual cc::SurfaceManager* GetSurfaceManager() = 0;
 
+  // Gets the display compositor responsible for hosting a SurfaceManager and
+  // dispensing CompositorFrameSinks.
+  virtual display_compositor::DisplayCompositor* GetDisplayCompositor() = 0;
+
   // Inform the display corresponding to this compositor if it is visible. When
   // false it does not need to produce any frames. Visibility is reset for each
   // call to CreateCompositorFrameSink.