Support swap damage rect using eglSwapBuffersWithDamageKHR

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 ba990f0a66bc376377487bea7907b925645e4273..1b9ffa089ea102d98a11f650e461d07886745b86 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -85,6 +85,9 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // Get the underlying platform specific surface "handle".
   virtual void* GetHandle() = 0;
 
+  // Returns whether or not the surface supports SwapBuffersWithDamage
+  virtual bool SupportsSwapBuffersWithDamage();
+
   // Returns whether or not the surface supports PostSubBuffer.
   virtual bool SupportsPostSubBuffer();
 
@@ -106,6 +109,12 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // the calling thread (i.e. same thread SwapBuffersAsync is called)
   virtual void SwapBuffersAsync(const SwapCompletionCallback& callback);
 
+  // Swap buffers with damage rect.
+  virtual gfx::SwapResult SwapBuffersWithDamage(int x,
+                                                int y,
+                                                int width,
+                                                int height);
+
   // Copy part of the backbuffer to the frontbuffer.
   virtual gfx::SwapResult PostSubBuffer(int x, int y, int width, int height);