Add compositing, layers to app_list_demo

ui/views_content_client/views_content_client_main_parts_mac.mm

Index: ui/views_content_client/views_content_client_main_parts_mac.mm
diff --git a/ui/views_content_client/views_content_client_main_parts_mac.mm b/ui/views_content_client/views_content_client_main_parts_mac.mm
index 2c86c375140e0e02a1234b71dcdf3af6ba5da6c4..40c307fa131c2ff1ba0a334f63feff8bbcdb6be6 100644
--- a/ui/views_content_client/views_content_client_main_parts_mac.mm
+++ b/ui/views_content_client/views_content_client_main_parts_mac.mm
@@ -7,8 +7,10 @@
 #include "base/files/file_path.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/path_service.h"
+#include "content/public/browser/context_factory.h"
 #include "content/public/common/content_paths.h"
 #include "content/shell/browser/shell_browser_context.h"
+#include "ui/views/test/desktop_test_views_delegate.h"
 #include "ui/views_content_client/views_content_client.h"
 #include "ui/views_content_client/views_content_client_main_parts.h"
 
@@ -40,10 +42,18 @@ class ViewsContentClientMainPartsMac : public ViewsContentClientMainParts {
 
  private:
   base::scoped_nsobject<ViewsContentClientAppController> app_controller_;
+  scoped_ptr<views::ViewsDelegate> composited_views_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewsContentClientMainPartsMac);
 };
 
+class CompositedTestViewsDelegate : public views::DesktopTestViewsDelegate {
+ public:
+  virtual ui::ContextFactory* GetContextFactory() OVERRIDE {
+    return content::GetContextFactory();
+  }
+};
+
 ViewsContentClientMainPartsMac::ViewsContentClientMainPartsMac(
     const content::MainFunctionParams& content_params,
     ViewsContentClient* views_content_client)
@@ -59,6 +69,14 @@ ViewsContentClientMainPartsMac::ViewsContentClientMainPartsMac(
 void ViewsContentClientMainPartsMac::PreMainMessageLoopRun() {
   ViewsContentClientMainParts::PreMainMessageLoopRun();
 
+  views_delegate_.reset();  // FIXME
+
+  // If run with --enable-delegated-renderer, the GPU channel factory and image
+  // transport factory for communicating with the GPU process should already be
+  // initialized. This is the default on Mac as of r281692. Otherwise, this file
+  // needs a content/browser dependency and some initialization steps here.
+  composited_views_delegate_.reset(new CompositedTestViewsDelegate);
+
   // On Mac, the task must be deferred to applicationDidFinishLaunching. If not,
   // the widget can activate, but (even if configured) the mainMenu won't be
   // ready to switch over in the OSX UI, so it will look strange.