Split DCLayerOverlayProcessor::Process into three functions.

cc/output/dc_layer_overlay.h

Index: cc/output/dc_layer_overlay.h
diff --git a/cc/output/dc_layer_overlay.h b/cc/output/dc_layer_overlay.h
index 6daeedc02e71ee8a9166823f4ff8be84e594313e..cd5976f511200a4a324ec776df282327e2713b6b 100644
--- a/cc/output/dc_layer_overlay.h
+++ b/cc/output/dc_layer_overlay.h
@@ -96,6 +96,20 @@ class DCLayerOverlayProcessor {
                              QuadList::ConstIterator quad_list_begin,
                              QuadList::ConstIterator quad,
                              DCLayerOverlay* ca_layer_overlay);
+  bool ProcessForOverlay(const gfx::RectF& display_rect,
+                         QuadList* quad_list,
+                         const gfx::Rect& quad_rectangle,
+                         const gfx::RectF& occlusion_bounding_box,
+                         const QuadList::Iterator& it,
+                         gfx::Rect* damage_rect);
+  bool ProcessForUnderlay(const gfx::RectF& display_rect,
+                          QuadList* quad_list,
+                          const gfx::Rect& quad_rectangle,
+                          const gfx::RectF& occlusion_bounding_box,
+                          const QuadList::Iterator& it,
+                          gfx::Rect* damage_rect,
+                          gfx::Rect* this_frame_underlay_rect,
+                          DCLayerOverlay* dc_layer);
 
   gfx::Rect previous_frame_underlay_rect_;
   gfx::Rect previous_occlusion_bounding_box_;