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

content/renderer/gpu/mailbox_output_surface.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/gpu/mailbox_output_surface.h"
 
 #include "base/logging.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/gl_frame_data.h"
@@ skipping 107 matching lines @@
   if (!fbo_)
     fbo_ = context3d_->createFramebuffer();
   context3d_->bindFramebuffer(GL_FRAMEBUFFER, fbo_);
   context3d_->framebufferTexture2D(
       GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
       current_backing_.texture_id, 0);
 }
 
 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());
 
   frame->gl_frame_data->mailbox = current_backing_.mailbox;
   frame->gl_frame_data->size = current_backing_.size;
   context3d_->flush();
   frame->gl_frame_data->sync_point = context3d_->insertSyncPoint();
   CompositorOutputSurface::SendFrameToParentCompositor(frame);
 
@@ skipping 37 matching lines @@
     pending_textures_.pop_front();
   }
   CompositorOutputSurface::OnSwapAck(ack);
 }
 
 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);
 }
 
 size_t MailboxOutputSurface::GetNumAcksPending() {
   DCHECK(pending_textures_.size());
   return pending_textures_.size() - 1;
 }
 
 }  // namespace content