Early terminate flings when scrolling impossible

content/renderer/input/input_event_filter.cc

 // Copyright 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.
 
 #include "content/renderer/input/input_event_filter.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "cc/input/input_handler.h"
+#include "content/common/input/did_overscroll_params.h"
 #include "content/common/input/web_input_event_traits.h"
 #include "content/common/input_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/common/content_switches.h"
 #include "ui/gfx/vector2d_f.h"
 
 using blink::WebInputEvent;
 
 #include "ipc/ipc_message_null_macros.h"
 #undef IPC_MESSAGE_DECL
@@ skipping 36 matching lines @@
   base::AutoLock locked(routes_lock_);
   routes_.insert(routing_id);
 }
 
 void InputEventFilter::DidRemoveInputHandler(int routing_id) {
   base::AutoLock locked(routes_lock_);
   routes_.erase(routing_id);
 }
 
 void InputEventFilter::DidOverscroll(int routing_id,
-                                     const cc::DidOverscrollParams& params) {
+                                     const DidOverscrollParams& params) {
   if (!overscroll_notifications_enabled_)
     return;
 
+  // TODO(jdduke): Use |params| as the sole message argument, crbug/354444.
   SendMessage(ViewHostMsg_DidOverscroll(routing_id,
                                         params.accumulated_overscroll,
                                         params.current_fling_velocity));
 }
 
 void InputEventFilter::DidStopFlinging(int routing_id) {
   SendMessage(ViewHostMsg_DidStopFlinging(routing_id));
 }
 
 void InputEventFilter::OnFilterAdded(IPC::Channel* channel) {
@@ skipping 109 matching lines @@
 void InputEventFilter::SendMessageOnIOThread(const IPC::Message& message) {
   DCHECK(io_loop_->BelongsToCurrentThread());
 
   if (!sender_)
     return;  // Filter was removed.
 
   sender_->Send(new IPC::Message(message));
 }
 
 }  // namespace content