Reset scroll status when a fling is ignored

content/renderer/input/input_handler_proxy.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_handler_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 511 matching lines @@
       fling_parameters_.sourceDevice = gesture_event.sourceDevice;
       input_handler_->SetNeedsAnimate();
       return DID_HANDLE;
     }
     case cc::InputHandler::SCROLL_UNKNOWN:
     case cc::InputHandler::SCROLL_ON_MAIN_THREAD: {
       TRACE_EVENT_INSTANT0("input",
                            "InputHandlerProxy::HandleGestureFling::"
                            "scroll_on_main_thread",
                            TRACE_EVENT_SCOPE_THREAD);
+      gesture_scroll_on_impl_thread_ = false;
       fling_may_be_active_on_main_thread_ = true;
       return DID_NOT_HANDLE;
     }
     case cc::InputHandler::SCROLL_IGNORED: {
       TRACE_EVENT_INSTANT0(
           "input",
           "InputHandlerProxy::HandleGestureFling::ignored",
           TRACE_EVENT_SCOPE_THREAD);
+      gesture_scroll_on_impl_thread_ = false;
       if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) {
         // We still pass the curve to the main thread if there's nothing
         // scrollable, in case something
         // registers a handler before the curve is over.
         return DID_NOT_HANDLE;
       }
       return DROP_EVENT;
     }
     case cc::InputHandler::ScrollStatusCount:
       NOTREACHED();
@@ skipping 391 matching lines @@
   // trigger a scroll, e.g., with a trivial time delta between fling updates.
   // Return true in this case to prevent early fling termination.
   if (std::abs(clipped_increment.width) < kScrollEpsilon &&
       std::abs(clipped_increment.height) < kScrollEpsilon)
     return true;
 
   return did_scroll;
 }
 
 }  // namespace content