cc: Move worker threads to content.

content/renderer/gpu/compositor_dependencies.h

Index: content/renderer/gpu/compositor_dependencies.h
diff --git a/content/renderer/gpu/compositor_dependencies.h b/content/renderer/gpu/compositor_dependencies.h
index 9aae19f2db1182fa87920adc796fdc7f1eece36e..ae2e4e5807e7c553a0a7fd9b8420b6d521aa9152 100644
--- a/content/renderer/gpu/compositor_dependencies.h
+++ b/content/renderer/gpu/compositor_dependencies.h
@@ -16,6 +16,7 @@ namespace cc {
 class BeginFrameSource;
 class ContextProvider;
 class SharedBitmapManager;
+class TaskGraphRunner;
 }
 
 namespace gpu {
@@ -52,6 +53,8 @@ class CompositorDependencies {
   virtual cc::ContextProvider* GetSharedMainThreadContextProvider() = 0;
   virtual scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
       int routing_id) = 0;
+  virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
+  virtual bool IsGatherPixelRefsEnabled() = 0;
 
   virtual ~CompositorDependencies() {}
 };