Unify Android Webview and Chrome's fling

android_webview/browser/browser_view_renderer_client.h

 // Copyright 2014 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 ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size_f.h"
@@ skipping 37 matching lines @@
   // current contents_size to |contents_size_dip|,
   // the current page scale to |page_scale_factor| and page scale limits
   // to |min_page_scale_factor|..|max_page_scale_factor|.
   virtual void UpdateScrollState(gfx::Vector2d max_scroll_offset,
                                  gfx::SizeF contents_size_dip,
                                  float page_scale_factor,
                                  float min_page_scale_factor,
                                  float max_page_scale_factor) = 0;
 
   // Handle overscroll.
-  virtual void DidOverscroll(gfx::Vector2d overscroll_delta) = 0;
+  virtual void DidOverscroll(gfx::Vector2d overscroll_delta,
+                             gfx::Vector2dF overscroll_velocity,
+                             bool first_overscroll_x,
+                             bool first_overscroll_y) = 0;
 
   // Visible for testing
   // Called when the parent draw constraints in browser view renderer gets
   // updated.
   virtual void ParentDrawConstraintsUpdated(
       const ParentCompositorDrawConstraints& draw_constraints) = 0;
 
  protected:
   virtual ~BrowserViewRendererClient() {}
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_CLIENT_H_