cc: Add strict layer property change checking and handle bounds changes during paint.

cc/trees/layer_tree_host.h

 // Copyright 2011 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_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <vector>
 
@@ skipping 227 matching lines @@
     return animation_registrar_.get();
   }
 
   skia::RefPtr<SkPicture> CapturePicture();
 
   bool BlocksPendingCommit() const;
 
   // Obtains a thorough dump of the LayerTreeHost as a value.
   scoped_ptr<base::Value> AsValue() const;
 
+  bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
+
  protected:
   LayerTreeHost(LayerTreeHostClient* client, const LayerTreeSettings& settings);
   bool Initialize(scoped_ptr<Thread> impl_thread);
   bool InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing);
 
  private:
   bool InitializeProxy(scoped_ptr<Proxy> proxy);
   void InitializeRenderer();
 
   bool PaintLayerContents(const LayerList& render_surface_layer_list,
@@ skipping 48 matching lines @@
   float overdraw_bottom_height_;
   float device_scale_factor_;
 
   bool visible_;
 
   typedef base::hash_map<WebKit::WebGraphicsContext3D*,
                          scoped_refptr<RateLimiter> > RateLimiterMap;
   RateLimiterMap rate_limiters_;
 
   float page_scale_factor_;
-  float min_page_scale_factor_, max_page_scale_factor_;
+  float min_page_scale_factor_;
+  float max_page_scale_factor_;
   gfx::Transform impl_transform_;
   bool trigger_idle_updates_;
 
   SkColor background_color_;
   bool has_transparent_background_;
 
   typedef ScopedPtrVector<PrioritizedResource> TextureList;
   size_t partial_texture_update_requests_;
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
 
   struct PendingPageScaleAnimation {
     gfx::Vector2d target_offset;
     bool use_anchor;
     float scale;
     base::TimeDelta duration;
   };
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
+  bool in_paint_layer_contents_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_