[Android] Implementation of overscroll effect for Android L

content/browser/renderer_host/render_widget_host_view_android.h

 // Copyright (c) 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
 #include <queue>
 
@@ skipping 307 matching lines @@
   scoped_refptr<cc::DelegatedFrameResourceCollection> resource_collection_;
   scoped_refptr<cc::DelegatedFrameProvider> frame_provider_;
   scoped_refptr<cc::DelegatedRendererLayer> layer_;
 
   // The most recent texture size that was pushed to the texture layer.
   gfx::Size texture_size_in_layer_;
 
   // The most recent content size that was pushed to the texture layer.
   gfx::Size content_size_in_layer_;
 
-  // The device scale of the last received frame.
-  float device_scale_factor_;
-
   // The output surface id of the last received frame.
   uint32_t last_output_surface_id_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   std::queue<base::Closure> ack_callbacks_;
 
   const bool overscroll_effect_enabled_;
   // Used to render overscroll overlays.
   // Note: |overscroll_effect_| will never be NULL, even if it's never enabled.
   scoped_ptr<OverscrollGlow> overscroll_effect_;
+  gfx::PointF last_scroll_update_position_;
 
   // Provides gesture synthesis given a stream of touch events (derived from
   // Android MotionEvent's) and touch event acks.
   ui::FilteredGestureProvider gesture_provider_;
 
   // Handles gesture based text selection
   GestureTextSelector gesture_text_selector_;
 
   bool flush_input_requested_;
 
@@ skipping 20 matching lines @@
   scoped_ptr<LastFrameInfo> last_frame_info_;
 
   TextSurroundingSelectionCallback text_surrounding_selection_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_