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

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index bd2298cc0a2c1328b26b447b0af2fb374256755e..425bd50099e21c06374c9db328c4942f791d30b4 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -245,6 +245,8 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   // 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);
@@ -313,7 +315,8 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   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_;
 
@@ -333,6 +336,8 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   };
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
+  bool in_paint_layer_contents_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };