Fix for often broken fling scrolls on Aura

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/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 331 matching lines @@
     }
   }
   return DID_NOT_HANDLE;
 }
 
 void InputHandlerProxy::Animate(base::TimeTicks time) {
   if (!fling_curve_)
     return;
 
   double monotonic_time_sec = InSecondsF(time);
-  if (!fling_parameters_.startTime) {
+  if (!fling_parameters_.startTime ||
+      monotonic_time_sec <= fling_parameters_.startTime) {
     fling_parameters_.startTime = monotonic_time_sec;
     input_handler_->ScheduleAnimation();
     return;
   }
 
   bool fling_is_active =
       fling_curve_->apply(monotonic_time_sec - fling_parameters_.startTime,
                           this);
 
   if (disallow_vertical_fling_scroll_ && disallow_horizontal_fling_scroll_)
@@ skipping 146 matching lines @@
 
   if (did_scroll) {
     fling_parameters_.cumulativeScroll.width += clipped_increment.width;
     fling_parameters_.cumulativeScroll.height += clipped_increment.height;
   }
 
   return did_scroll;
 }
 
 }  // namespace content