Make it possible for the scroll offset delegate to intercept fling.

content/browser/android/content_view_core_impl.h

 // Copyright 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_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 
 #include <vector>
 
 #include "base/android/jni_android.h"
@@ skipping 235 matching lines @@
                         const std::string& text,
                         int selection_start, int selection_end,
                         int composition_start, int composition_end,
                         bool show_ime_if_needed);
   void ProcessImeBatchStateAck(bool is_begin);
   void SetTitle(const string16& title);
   void OnBackgroundColorChanged(SkColor color);
 
   bool HasFocus();
   void ConfirmTouchEvent(InputEventAckState ack_result);
+  void UnhandledFlingStartEvent();
   void HasTouchEventHandlers(bool need_touch_events);
   void OnSelectionChanged(const std::string& text);
   void OnSelectionBoundsChanged(
       const ViewHostMsg_SelectionBounds_Params& params);
 
   void StartContentIntent(const GURL& content_url);
 
   // Shows the disambiguation popup
   // |target_rect|   --> window coordinates which |zoomed_bitmap| represents
   // |zoomed_bitmap| --> magnified image of potential touch targets
@@ skipping 97 matching lines @@
   ui::WindowAndroid* window_android_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewCoreImpl);
 };
 
 bool RegisterContentViewCore(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_