gpu: Add CHROMIUM_copy_image extension.

ui/gl/gl_surface.h

Index: ui/gl/gl_surface.h
diff --git a/ui/gl/gl_surface.h b/ui/gl/gl_surface.h
index 3e654cb8cf548789e696844689a5271ccc67c08d..4dfc4e04621d3f72c189482c733abb3e9a6024d9 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -215,6 +215,14 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // Called when the swap interval for the associated context changes.
   virtual void OnSetSwapInterval(int interval);
 
+  // Returns whether IsertFence() is supported.
+  virtual bool SupportsInsertFence();
+
+  // Insert fence and run |callback| when fence has signaled. The callback
+  // should be run on the calling thread (i.e. same thread InsertFence is
+  // called)
+  virtual void InsertFence(const base::Closure& callback);
+
  protected:
   virtual ~GLSurface();
 
@@ -282,6 +290,8 @@ class GL_EXPORT GLSurfaceAdapter : public GLSurface {
   bool IsSurfaceless() const override;
   bool FlipsVertically() const override;
   bool BuffersFlipped() const override;
+  bool SupportsInsertFence() override;
+  void InsertFence(const base::Closure& callback) override;
 
   GLSurface* surface() const { return surface_.get(); }