Allow switching DirectCompositionSurfaceWin between drawing modes.

cc/output/gl_renderer.cc

 // Copyright 2010 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 "cc/output/gl_renderer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 2446 matching lines @@
 
   ScheduleCALayers();
   ScheduleDCLayers();
   ScheduleOverlays();
 }
 
 void GLRenderer::FinishDrawingQuadList() {
   FlushTextureQuadCache(SHARED_BINDING);
 }
 
+void GLRenderer::SetEnableDCLayers(bool enable) {
+  gl_->SetEnableDCLayersCHROMIUM(enable);
+}
+
 bool GLRenderer::FlippedFramebuffer() const {
   if (force_drawing_frame_framebuffer_unflipped_)
     return false;
   if (current_frame()->current_render_pass != current_frame()->root_render_pass)
     return true;
   return FlippedRootFramebuffer();
 }
 
 bool GLRenderer::FlippedRootFramebuffer() const {
   // GL is normally flipped, so a flipped output results in an unflipping.
@@ skipping 1105 matching lines @@
     return;
 
   // Report GPU overdraw as a percentage of |max_result|.
   TRACE_COUNTER1(
       TRACE_DISABLED_BY_DEFAULT("cc.debug.overdraw"), "GPU Overdraw",
       (std::accumulate(overdraw->begin(), overdraw->end(), 0) * 100) /
           max_result);
 }
 
 }  // namespace cc