Introduce CompositorDependencies for RenderWidgetCompositor.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 883cd066a61e1e20659b827f657b07bef23463bb..c58a2e1a3527caf8affaf60ec01449845400bc92 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -70,6 +70,7 @@ class Range;
 }
 
 namespace content {
+class CompositorDependencies;
 class ExternalPopupMenu;
 class FrameSwapMessageQueue;
 class PepperPluginInstanceImpl;
@@ -92,6 +93,7 @@ class CONTENT_EXPORT RenderWidget
   // Creates a new RenderWidget.  The opener_id is the routing ID of the
   // RenderView that this widget lives inside.
   static RenderWidget* Create(int32 opener_id,
+                              CompositorDependencies* compositor_deps,
                               blink::WebPopupType popup_type,
                               const blink::WebScreenInfo& screen_info);
 
@@ -100,6 +102,7 @@ class CONTENT_EXPORT RenderWidget
 
   int32 routing_id() const { return routing_id_; }
   int32 surface_id() const { return surface_id_; }
+  CompositorDependencies* compositor_deps() const { return compositor_deps_; }
   blink::WebWidget* webwidget() const { return webwidget_; }
   gfx::Size size() const { return size_; }
   bool has_focus() const { return has_focus_; }
@@ -326,10 +329,11 @@ class CONTENT_EXPORT RenderWidget
 
   // Initializes this view with the given opener.  CompleteInit must be called
   // later.
-  bool Init(int32 opener_id);
+  bool Init(int32 opener_id, CompositorDependencies* compositor_deps);
 
   // Called by Init and subclasses to perform initialization.
   bool DoInit(int32 opener_id,
+              CompositorDependencies* compositor_deps,
               blink::WebWidget* web_widget,
               IPC::SyncMessage* create_widget_message);
 
@@ -555,6 +559,10 @@ class CONTENT_EXPORT RenderWidget
 
   int32 surface_id_;
 
+  // Dependencies for initializing a compositor, including flags for optional
+  // features.
+  CompositorDependencies* compositor_deps_;
+
   // We are responsible for destroying this object via its Close method.
   // May be NULL when the window is closing.
   blink::WebWidget* webwidget_;