Move frame_sink_id management to framesink_manager.cc/h from

content/browser/compositor/surface_utils.h

Index: content/browser/compositor/surface_utils.h
diff --git a/content/browser/compositor/surface_utils.h b/content/browser/compositor/surface_utils.h
index 804e387b2523785dfc28f3c4d58fe0415becd652..00ac6270a4a0d720d3473de8d66f428e0c64afe4 100644
--- a/content/browser/compositor/surface_utils.h
+++ b/content/browser/compositor/surface_utils.h
@@ -15,6 +15,7 @@
 
 namespace cc {
 class CopyOutputResult;
+class FrameSinkManager;
 class SurfaceManager;
 }  // namespace cc
 
@@ -23,6 +24,8 @@ namespace content {
 CONTENT_EXPORT cc::FrameSinkId AllocateFrameSinkId();
 
 CONTENT_EXPORT cc::SurfaceManager* GetSurfaceManager();
+CONTENT_EXPORT cc::FrameSinkManager* GetFrameSinkManager();
+
 
 void CopyFromCompositingSurfaceHasResult(
     const gfx::Size& dst_size_in_pixel,