mustash: enable GPU Compositing in renderer

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 3f4c190c2c644a4e696b0d75070ebeee702ca03c..27ea10f09e7e6f05417adfea3dc9768b2689dec3 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -7,6 +7,7 @@
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
@@ -52,6 +53,7 @@
 #include "content/renderer/render_process.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_view_impl.h"
+#include "content/renderer/render_widget_mus_connection.h"
 #include "content/renderer/renderer_blink_platform_impl.h"
 #include "content/renderer/resizing_mode_selector.h"
 #include "ipc/ipc_sync_message.h"
@@ -527,6 +529,7 @@ RenderWidget::RenderWidget(CompositorDependencies* compositor_deps,
       resizing_mode_selector_(new ResizingModeSelector()),
       context_menu_source_type_(ui::MENU_SOURCE_MOUSE),
       has_host_context_menu_location_(false) {
+  // base::debug::StackTrace().Print();
   if (!swapped_out)
     RenderProcess::current()->AddRefProcess();
   DCHECK(RenderThread::Get());
@@ -574,6 +577,7 @@ RenderWidget* RenderWidget::CreateForFrame(
     const blink::WebScreenInfo& screen_info,
     CompositorDependencies* compositor_deps,
     blink::WebLocalFrame* frame) {
+  // base::debug::StackTrace().Print();
   CHECK_NE(routing_id, MSG_ROUTING_NONE);
   // TODO(avi): Before RenderViewImpl has-a RenderWidget, the browser passes the
   // same routing ID for both the view routing ID and the main frame widget
@@ -1003,6 +1007,13 @@ GURL RenderWidget::GetURLForGraphicsContext3D() {
 }
 
 scoped_ptr<cc::OutputSurface> RenderWidget::CreateOutputSurface(bool fallback) {
+  RenderWidgetMusConnection* connection =
+      RenderWidgetMusConnection::Get(routing_id_);
+  fprintf(stderr, "EEE %s connection=%p\n", __func__, connection);
+  if (connection) {
+    return connection->CreateOutputSurface();
+  }
+
   // 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_);