mustash: enable GPU Compositing in renderer

content/renderer/render_widget.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/render_widget.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 76 matching lines @@
 #include "content/renderer/android/synchronous_compositor_filter.h"
 #include "content/renderer/android/synchronous_compositor_output_surface.h"
 #endif
 
 #if defined(OS_POSIX)
 #include "ipc/ipc_channel_posix.h"
 #include "third_party/skia/include/core/SkMallocPixelRef.h"
 #include "third_party/skia/include/core/SkPixelRef.h"
 #endif  // defined(OS_POSIX)
 
+#if defined(MOJO_SHELL_CLIENT)
+#include "content/public/common/mojo_shell_connection.h"
+#include "content/renderer/render_widget_mus_connection.h"
+#endif
+
 #include "third_party/WebKit/public/web/WebWidget.h"
 
 using blink::WebCompositionUnderline;
 using blink::WebCursorInfo;
 using blink::WebDeviceEmulationParams;
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
 using blink::WebKeyboardEvent;
 using blink::WebMouseEvent;
 using blink::WebMouseWheelEvent;
@@ skipping 899 matching lines @@
   // For widgets that are never visible, we don't start the compositor, so we
   // never get a request for a cc::OutputSurface.
   DCHECK(!compositor_never_visible_);
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   bool use_software = fallback;
   if (command_line.HasSwitch(switches::kDisableGpuCompositing))
     use_software = true;
 
+#if defined(MOJO_SHELL_CLIENT)
+  if (MojoShellConnection::Get()->GetApplication() && !use_software) {

[Ben Goodger (Google), 2015/12/01 22:46:57]

you should null check Get() before dereferencing. You won't have one of these
objects when you are not run from the external shell.

+    RenderWidgetMusConnection* connection =
+        RenderWidgetMusConnection::GetOrCreate(routing_id());
+    return connection->CreateOutputSurface();
+  }
+#endif
+
   scoped_refptr<ContextProviderCommandBuffer> context_provider;
   scoped_refptr<ContextProviderCommandBuffer> worker_context_provider;
   if (!use_software) {
     context_provider = ContextProviderCommandBuffer::Create(
         CreateGraphicsContext3D(true), RENDER_COMPOSITOR_CONTEXT);
     if (!context_provider.get()) {
       // Cause the compositor to wait and try again.
       return nullptr;
     }
     worker_context_provider =
@@ skipping 1425 matching lines @@
 void RenderWidget::RegisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.RemoveObserver(frame);
 }
 #endif  // defined(VIDEO_HOLE)
 
 }  // namespace content