Split DCLayerOverlayProcessor::Process into three functions.

cc/output/dc_layer_overlay.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_DC_LAYER_OVERLAY_H_
 #define CC_OUTPUT_DC_LAYER_OVERLAY_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/quads/render_pass.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 78 matching lines @@
     previous_frame_underlay_rect_ = gfx::Rect();
     previous_occlusion_bounding_box_ = gfx::Rect();
   }
 
  private:
   DCLayerResult FromDrawQuad(ResourceProvider* resource_provider,
                              const gfx::RectF& display_rect,
                              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_;
   gfx::RectF previous_display_rect_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DC_LAYER_OVERLAY_H_