cc: Do not allow gesture-scrolling 'overflow[-{x|y}]:hidden' layers.

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>
 
@@ skipping 233 matching lines @@
   void SetScrollOffset(gfx::Vector2d scroll_offset);
   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
   void SetScrollOffsetFromImplSide(gfx::Vector2d scroll_offset);
 
   void SetMaxScrollOffset(gfx::Vector2d max_scroll_offset);
   gfx::Vector2d max_scroll_offset() const { return max_scroll_offset_; }
 
   void SetScrollable(bool scrollable);
   bool scrollable() const { return scrollable_; }
 
+  void SetUserScrollable(bool horizontal, bool vertical);
+  bool user_scrollable_horizontal() const {
+    return user_scrollable_horizontal_;
+  }
+  bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
+
   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread);
   bool should_scroll_on_main_thread() const {
     return should_scroll_on_main_thread_;
   }
 
   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers);
   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 
   void SetNonFastScrollableRegion(const Region& non_fast_scrollable_region);
   const Region& non_fast_scrollable_region() const {
@@ skipping 268 matching lines @@
   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 
   // Layer properties.
   gfx::Size bounds_;
 
   gfx::Vector2d scroll_offset_;
   gfx::Vector2d max_scroll_offset_;
   bool scrollable_;
   bool should_scroll_on_main_thread_;
   bool have_wheel_event_handlers_;
+  bool user_scrollable_horizontal_;
+  bool user_scrollable_vertical_;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   gfx::PointF position_;
   gfx::PointF anchor_point_;
   SkColor background_color_;
   CompositingReasons compositing_reasons_;
   float opacity_;
   FilterOperations filters_;
   FilterOperations background_filters_;
   float anchor_point_z_;
@@ skipping 32 matching lines @@
   DrawProperties<Layer> draw_properties_;
 
   PaintProperties paint_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_