mustash: Implement basic input event routing in renderer

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 765f8267aec496581abda938b90970bdefc8e120..8f1972272dfc428b953cb6a155b68f53e37db531 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -28,6 +28,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "content/child/appcache/appcache_dispatcher.h"
@@ -213,6 +214,7 @@
 #if defined(MOJO_SHELL_CLIENT)
 #include "content/public/common/mojo_shell_connection.h"
 #include "content/renderer/render_widget_mus_connection.h"
+#include "mojo/application/public/cpp/application_impl.h"
 #endif
 
 using blink::WebAXObject;
@@ -1720,7 +1722,7 @@ scoped_ptr<cc::OutputSurface> RenderViewImpl::CreateOutputSurface(
     bool fallback) {
   if (MojoShellConnection::Get()->GetApplication()) {
     RenderWidgetMusConnection* connection =
-        RenderWidgetMusConnection::Get(routing_id());
+        RenderWidgetMusConnection::GetOrCreate(routing_id());
     return connection->CreateOutputSurface();
   }
   return RenderWidget::CreateOutputSurface(fallback);