cc: Move ownership of surfaces to SurfaceManager

cc/surfaces/surface.h

Index: cc/surfaces/surface.h
diff --git a/cc/surfaces/surface.h b/cc/surfaces/surface.h
index 1dc71b75761d28b2c20fe13cf9f24d4fc6dd0909..3dafbba93b257f71e4c987ec8a39183f07c4add7 100644
--- a/cc/surfaces/surface.h
+++ b/cc/surfaces/surface.h
@@ -130,6 +130,8 @@ class CC_SURFACES_EXPORT Surface {
   bool destroyed() const { return destroyed_; }
   void set_destroyed(bool destroyed) { destroyed_ = destroyed; }
 
+  base::WeakPtr<Surface> AsWeakPtr();
+
  private:
   struct FrameData {
     FrameData(CompositorFrame&& frame,
@@ -177,6 +179,8 @@ class CC_SURFACES_EXPORT Surface {
 
   base::flat_set<SurfaceId> blocking_surfaces_;
 
+  base::WeakPtrFactory<Surface> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };