gpu: Avoid flinging beyond content edge

content/renderer/gpu/input_handler_proxy.h

 // Copyright (c) 2013 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_RENDERER_GPU_INPUT_HANDLER_PROXY_H_
 #define CONTENT_RENDERER_GPU_INPUT_HANDLER_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 69 matching lines @@
 #ifndef NDEBUG
   bool expect_scroll_update_end_;
   bool expect_pinch_update_end_;
 #endif
   bool gesture_scroll_on_impl_thread_;
   bool gesture_pinch_on_impl_thread_;
   // This is always false when there are no flings on the main thread, but
   // conservative in the sense that we might not be actually flinging when it is
   // true.
   bool fling_may_be_active_on_main_thread_;
+  // The axes on which the current fling has overshot the bounds of the content.
+  bool fling_overscrolled_horizontally_;
+  bool fling_overscrolled_vertically_;
 
   DISALLOW_COPY_AND_ASSIGN(InputHandlerProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_INPUT_HANDLER_PROXY_H_