Dummy WebGestureEvent() sent to SendGestureScrollEvent() needs proper type.

content/browser/renderer_host/render_widget_host_input_event_router.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/browser/renderer_host/render_widget_host_input_event_router.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "cc/quads/surface_draw_quad.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/frame_messages.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace {
 
 void TransformEventTouchPositions(blink::WebTouchEvent* event,
                                   const gfx::Vector2d& delta) {
   for (unsigned i = 0; i < event->touchesLength; ++i) {
      event->touches[i].position.x += delta.x();
      event->touches[i].position.y += delta.y();
   }
 }
 
+blink::WebGestureEvent DummyGestureScrollUpdate() {
+  blink::WebGestureEvent dummy_gesture_scroll_update;
+  dummy_gesture_scroll_update.type = blink::WebInputEvent::GestureScrollUpdate;
+  return dummy_gesture_scroll_update;
+}
+
 }  // anonymous namespace
 
 namespace content {
 
 void RenderWidgetHostInputEventRouter::OnRenderWidgetHostViewBaseDestroyed(
     RenderWidgetHostViewBase* view) {
   view->RemoveObserver(this);
 
   // Remove this view from the owner_map.
   for (auto entry : owner_map_) {
@@ skipping 209 matching lines @@
         // might be to always transform each point to the |touch_target_.target|
         // for the duration of the sequence.
         touch_target_.delta = transformed_point - original_point;
         touchscreen_gesture_target_queue_.push_back(touch_target_);
 
         if (!touch_target_.target)
           return;
 
         if (touch_target_.target == bubbling_gesture_scroll_target_.target) {
           SendGestureScrollEnd(bubbling_gesture_scroll_target_.target,
-                               blink::WebGestureEvent());
+                               DummyGestureScrollUpdate());
           CancelScrollBubbling(bubbling_gesture_scroll_target_.target);
         }
       }
 
       if (touch_target_.target) {
         TransformEventTouchPositions(event, touch_target_.delta);
         touch_target_.target->ProcessTouchEvent(*event, latency);
       }
       break;
     }
@@ skipping 224 matching lines @@
     }
 
     touchscreen_gesture_target_ = touchscreen_gesture_target_queue_.front();
     touchscreen_gesture_target_queue_.pop_front();
 
     // Abort any scroll bubbling in progress to avoid double entry.
     if (touchscreen_gesture_target_.target &&
         touchscreen_gesture_target_.target ==
             bubbling_gesture_scroll_target_.target) {
       SendGestureScrollEnd(bubbling_gesture_scroll_target_.target,
-                           blink::WebGestureEvent());
+                           DummyGestureScrollUpdate());
       CancelScrollBubbling(bubbling_gesture_scroll_target_.target);
     }
   }
 
   if (!touchscreen_gesture_target_.target)
     return;
 
   // TODO(mohsen): Add tests to check event location.
   event->x += touchscreen_gesture_target_.delta.x();
   event->y += touchscreen_gesture_target_.delta.y();
@@ skipping 17 matching lines @@
     // touchpad gesture sequence, though this could be wrong; a better approach
     // might be to always transform each point to the
     // |touchpad_gesture_target_.target| for the duration of the sequence.
     touchpad_gesture_target_.delta = transformed_point - original_point;
 
     // Abort any scroll bubbling in progress to avoid double entry.
     if (touchpad_gesture_target_.target &&
         touchpad_gesture_target_.target ==
             bubbling_gesture_scroll_target_.target) {
       SendGestureScrollEnd(bubbling_gesture_scroll_target_.target,
-                           blink::WebGestureEvent());
+                           DummyGestureScrollUpdate());
       CancelScrollBubbling(bubbling_gesture_scroll_target_.target);
     }
   }
 
   if (!touchpad_gesture_target_.target)
     return;
 
   // TODO(mohsen): Add tests to check event location.
   event->x += touchpad_gesture_target_.delta.x();
   event->y += touchpad_gesture_target_.delta.y();
   touchpad_gesture_target_.target->ProcessGestureEvent(*event, latency);
 }
 
 }  // namespace content