Reland: cc: Fix size_t to int truncations in layers/ output/ playback/ quads/

cc/layers/layer.h

 // Copyright 2010 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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 653 matching lines @@
  private:
   friend class base::RefCounted<Layer>;
   friend class LayerTreeHostCommon;
   void SetParent(Layer* layer);
   bool DescendantIsFixedToContainerLayer() const;
 
   // This should only be called during BeginMainFrame since it does not
   // trigger a Commit.
   void SetHasRenderSurface(bool has_render_surface);
 
-  // Returns the index of the child or -1 if not found.
-  int IndexOfChild(const Layer* reference);
-
   // This should only be called from RemoveFromParent().
   void RemoveChildOrDependent(Layer* child);
 
   // LayerAnimationValueProvider implementation.
   gfx::ScrollOffset ScrollOffsetForAnimation() const override;
 
   // LayerAnimationValueObserver implementation.
   void OnFilterAnimated(const FilterOperations& filters) override;
   void OnOpacityAnimated(float opacity) override;
   void OnTransformAnimated(const gfx::Transform& transform) override;
@@ skipping 110 matching lines @@
 
   std::vector<FrameTimingRequest> frame_timing_requests_;
   bool frame_timing_requests_dirty_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_