Fixed two-finger pan filtering with 'touch-action: pan-x pan-y'.

content/common/input/synthetic_web_input_event_builders.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/common/input/synthetic_web_input_event_builders.h"
 
 #include "base/logging.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "ui/events/base_event_utils.h"
 #include "ui/events/event.h"
@@ skipping 99 matching lines @@
     result.data.tap.tapCount = 1;
     result.data.tap.width = 10;
     result.data.tap.height = 10;
   }
   return result;
 }
 
 WebGestureEvent SyntheticWebGestureEventBuilder::BuildScrollBegin(
     float dx_hint,
     float dy_hint,
-    blink::WebGestureDevice source_device) {
+    blink::WebGestureDevice source_device,
+    int pointer_count) {
   WebGestureEvent result =
       Build(WebInputEvent::GestureScrollBegin, source_device);
   result.data.scrollBegin.deltaXHint = dx_hint;
   result.data.scrollBegin.deltaYHint = dy_hint;
+  result.data.scrollBegin.pointerCount = pointer_count;
   return result;
 }
 
 WebGestureEvent SyntheticWebGestureEventBuilder::BuildScrollUpdate(
     float dx,
     float dy,
     int modifiers,
     blink::WebGestureDevice source_device) {
   WebGestureEvent result =
       Build(WebInputEvent::GestureScrollUpdate, source_device, modifiers);
@@ skipping 114 matching lines @@
 
 int SyntheticWebTouchEvent::FirstFreeIndex() {
   for (size_t i = 0; i < kTouchesLengthCap; ++i) {
     if (touches[i].state == WebTouchPoint::StateUndefined)
       return i;
   }
   return -1;
 }
 
 }  // namespace content