content: Add command line flag for native GPU memory buffers.

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 217 matching lines @@
         render_thread->is_impl_side_painting_enabled();
     settings.gpu_rasterization_forced =
         render_thread->is_gpu_rasterization_forced();
     settings.gpu_rasterization_enabled =
         render_thread->is_gpu_rasterization_enabled();
     settings.can_use_lcd_text = render_thread->is_lcd_text_enabled();
     settings.use_distance_field_text =
         render_thread->is_distance_field_text_enabled();
     settings.use_zero_copy = render_thread->is_zero_copy_enabled();
     settings.use_one_copy = render_thread->is_one_copy_enabled();
+    settings.use_image_external = render_thread->use_image_external();
   }
 
   settings.calculate_top_controls_position =
       cmd->HasSwitch(cc::switches::kEnableTopControlsPositionCalculation);
   if (cmd->HasSwitch(cc::switches::kTopControlsHeight)) {
     std::string controls_height_str =
         cmd->GetSwitchValueASCII(cc::switches::kTopControlsHeight);
     double controls_height;
     if (base::StringToDouble(controls_height_str, &controls_height) &&
         controls_height > 0)
@@ skipping 647 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content