Start of hardware overlay support in CC with Ubercompositor.

cc/quads/render_pass.h

Index: cc/quads/render_pass.h
diff --git a/cc/quads/render_pass.h b/cc/quads/render_pass.h
index 4285e53010311d27d7b4fd58ddb70f81b15354c0..5cada2a2f146ac4906cff82495cf91386c6a992e 100644
--- a/cc/quads/render_pass.h
+++ b/cc/quads/render_pass.h
@@ -62,6 +62,11 @@ class CC_EXPORT RenderPass {
     }
   };
 
+  // Specifies whether the pass is going into an overlay, needs to be rendered
+  // into a buffer before it can be presented to overlay hardware or a quad
+  // inside it is presented as is.
+  enum OverlayState { NO_OVERLAY, RENDER_AND_OVERLAY, SIMPLE_OVERLAY, };
+
   ~RenderPass();
 
   static scoped_ptr<RenderPass> Create();
@@ -84,7 +89,8 @@ class CC_EXPORT RenderPass {
               const gfx::Rect& output_rect,
               const gfx::RectF& damage_rect,
               const gfx::Transform& transform_to_root_target,
-              bool has_transparent_background);
+              bool has_transparent_background,
+              OverlayState overlay_state);
 
   scoped_ptr<base::Value> AsValue() const;
 
@@ -111,6 +117,8 @@ class CC_EXPORT RenderPass {
   QuadList quad_list;
   SharedQuadStateList shared_quad_state_list;
 
+  OverlayState overlay_state;
+
  protected:
   explicit RenderPass(size_t num_layers);
   RenderPass();