Use WebKit compositor in ui::Layer

ui/aura_shell/examples/aura_shell_main.cc

Index: ui/aura_shell/examples/aura_shell_main.cc
diff --git a/ui/aura_shell/examples/aura_shell_main.cc b/ui/aura_shell/examples/aura_shell_main.cc
index aa8fc7d74969ecd1e89dea9deb14ea47319472df..a2688e16530dc8803073edd273ffdd9f69367a53 100644
--- a/ui/aura_shell/examples/aura_shell_main.cc
+++ b/ui/aura_shell/examples/aura_shell_main.cc
@@ -15,6 +15,7 @@
 #include "ui/aura_shell/shell_factory.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
+#include "ui/gfx/compositor/compositor_test_support.h"
 
 namespace {
 
@@ -69,6 +70,7 @@ int main(int argc, char** argv) {
 
   // Create the message-loop here before creating the desktop.
   MessageLoop message_loop(MessageLoop::TYPE_UI);
+  ui::CompositorTestSupport::Initialize();
 
   aura_shell::Shell::GetInstance()->SetDelegate(new ShellDelegateImpl);;
 
@@ -78,6 +80,8 @@ int main(int argc, char** argv) {
 
   delete aura::Desktop::GetInstance();
 
+  ui::CompositorTestSupport::Terminate();
+
   return 0;
 }