Fix issues related to a continuous event getting coalesced with a discrete event.

content/renderer/input/render_widget_input_handler.cc

 // Copyright 2015 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/render_widget_input_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 379 matching lines @@
       delegate_->ObserveGestureEventAndResult(
           gesture_event,
           event_overscroll ? event_overscroll->latest_overscroll_delta
                            : gfx::Vector2dF(),
           processed != WebInputEventResult::NotHandled);
     }
   }
 
   TRACE_EVENT_SYNTHETIC_DELAY_END("blink.HandleInputEvent");
 
-  if (dispatch_type == DISPATCH_TYPE_BLOCKING_NOTIFY_MAIN) {
+  if (dispatch_type == DISPATCH_TYPE_BLOCKING_NOTIFY_MAIN ||
+      dispatch_type == DISPATCH_TYPE_NON_BLOCKING_NOTIFY_MAIN) {
     // |non_blocking| means it was ack'd already by the InputHandlerProxy
     // so let the delegate know the event has been handled.
     delegate_->NotifyInputEventHandled(input_event.type, ack_result);
   }
 
   if ((dispatch_type == DISPATCH_TYPE_BLOCKING ||
        dispatch_type == DISPATCH_TYPE_BLOCKING_NOTIFY_MAIN)) {
     std::unique_ptr<InputEventAck> response(new InputEventAck(
         InputEventAckSource::MAIN_THREAD, input_event.type, ack_result,
         swap_latency_info, std::move(event_overscroll),
@@ skipping 59 matching lines @@
   // it can be bundled in the event ack.
   if (handling_event_overscroll_) {
     *handling_event_overscroll_ = std::move(params);
     return;
   }
 
   delegate_->OnDidOverscroll(*params);
 }
 
 }  // namespace content