Aura: Support --enable-partial-swap with --composite-to-mailbox

content/renderer/gpu/mailbox_output_surface.cc

Index: content/renderer/gpu/mailbox_output_surface.cc
diff --git a/content/renderer/gpu/mailbox_output_surface.cc b/content/renderer/gpu/mailbox_output_surface.cc
index d7b13ce3ad361bebff278c43c26e944a9eca233b..84fbf4ed13e914f58cf1ed345b7a92c1ed561591 100644
--- a/content/renderer/gpu/mailbox_output_surface.cc
+++ b/content/renderer/gpu/mailbox_output_surface.cc
@@ -125,8 +125,6 @@ void MailboxOutputSurface::BindFramebuffer() {
 
 void MailboxOutputSurface::SendFrameToParentCompositor(
     cc::CompositorFrame* frame) {
-  frame->gl_frame_data.reset(new GLFrameData());
-
   DCHECK(!surface_size_.IsEmpty());
   DCHECK(surface_size_ == current_backing_.size);
   DCHECK(!current_backing_.mailbox.IsZero());
@@ -184,9 +182,6 @@ void MailboxOutputSurface::SwapBuffers(const ui::LatencyInfo&) {
 
 void MailboxOutputSurface::PostSubBuffer(gfx::Rect rect,
                                          const ui::LatencyInfo&) {
-  NOTIMPLEMENTED()
-      << "Partial swap not supported with composite-to-mailbox yet.";
-
   // The browser only copies damage correctly for two buffers in use.
   DCHECK(GetNumAcksPending() < 2);
 }