cc: Implement overdraw feedback debugging feature.

cc/output/direct_renderer.h

 // Copyright 2012 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_DIRECT_RENDERER_H_
 #define CC_OUTPUT_DIRECT_RENDERER_H_
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
@@ skipping 170 matching lines @@
   OutputSurface* const output_surface_;
   ResourceProvider* const resource_provider_;
   // This can be replaced by test implementations.
   std::unique_ptr<OverlayProcessor> overlay_processor_;
 
   // Whether it's valid to SwapBuffers with an empty rect. Trivially true when
   // using partial swap.
   bool allow_empty_swap_;
   // Whether partial swap can be used.
   bool use_partial_swap_;
+  // Whether overdraw feedback is enabled and can be used.
+  bool overdraw_feedback_ = false;
 
   // TODO(danakj): Just use a vector of pairs here? Hash map is way overkill.
   std::unordered_map<int, std::unique_ptr<ScopedResource>>
       render_pass_textures_;
   std::unordered_map<int, TileDrawQuad> render_pass_bypass_quads_;
 
   RenderPassFilterList render_pass_filters_;
   RenderPassFilterList render_pass_background_filters_;
 
   bool visible_ = false;
 
   // For use in coordinate conversion, this stores the output rect, viewport
   // rect (= unflipped version of glViewport rect), the size of target
   // framebuffer, and the current window space viewport. During a draw, this
   // stores the values for the current render pass; in between draws, they
   // retain the values for the root render pass of the last draw.
   gfx::Rect current_draw_rect_;
   gfx::Rect current_viewport_rect_;
   gfx::Size current_surface_size_;
   gfx::Rect current_window_space_viewport_;
 
  private:
   bool initialized_ = false;
+#if DCHECK_IS_ON()
+  bool overdraw_feedback_support_missing_logged_once_ = false;
+#endif
   gfx::Size enlarge_pass_texture_amount_;
 
   // Cached values given to Reshape().
   gfx::Size reshape_surface_size_;
   float reshape_device_scale_factor_ = 0.f;
   gfx::ColorSpace reshape_device_color_space_;
   bool reshape_has_alpha_ = false;
+  bool reshape_use_stencil_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_