[Android] Add a native pull-to-refresh overscroll effect

content/browser/renderer_host/ui_events_helper.cc

 // Copyright (c) 2012 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/browser/renderer_host/ui_events_helper.h"
 
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/events/event.h"
@@ skipping 166 matching lines @@
       gesture_event.type = blink::WebInputEvent::GestureScrollBegin;
       gesture_event.data.scrollBegin.deltaXHint =
           event.details().scroll_x_hint();
       gesture_event.data.scrollBegin.deltaYHint =
           event.details().scroll_y_hint();
       break;
     case ui::ET_GESTURE_SCROLL_UPDATE:
       gesture_event.type = blink::WebInputEvent::GestureScrollUpdate;
       gesture_event.data.scrollUpdate.deltaX = event.details().scroll_x();
       gesture_event.data.scrollUpdate.deltaY = event.details().scroll_y();
+      gesture.data.scrollUpdate.isFirstUpdate =
+          data.details.is_first_scroll_update();
       break;
     case ui::ET_GESTURE_SCROLL_END:
       gesture_event.type = blink::WebInputEvent::GestureScrollEnd;
       break;
     case ui::ET_GESTURE_PINCH_BEGIN:
       gesture_event.type = blink::WebInputEvent::GesturePinchBegin;
       break;
     case ui::ET_GESTURE_PINCH_UPDATE:
       gesture_event.type = blink::WebInputEvent::GesturePinchUpdate;
       gesture_event.data.pinchUpdate.scale = event.details().scale();
@@ skipping 106 matching lines @@
   // Update the type of the touch event.
   WebTouchEventTraits::ResetType(TouchEventTypeFromEvent(event),
                                  event.time_stamp().InSecondsF(),
                                  web_event);
   web_event->modifiers = EventFlagsToWebEventModifiers(event.flags());
 
   return point;
 }
 
 }  // namespace content