Fix movementX/Y attributes for touch pointer events

ui/events/blink/blink_event_util_unittest.cc

 // Copyright 2016 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 "ui/events/blink/blink_event_util.h"
 
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebGestureEvent.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
@@ skipping 10 matching lines @@
       CreateWebGestureEvent(details,
                             base::TimeTicks(),
                             gfx::PointF(1.f, 1.f),
                             gfx::PointF(1.f, 1.f),
                             0,
                             0U);
   EXPECT_FALSE(ScaleWebInputEvent(event, 1.f));
   EXPECT_TRUE(ScaleWebInputEvent(event, 2.f));
 }
 
+TEST(BlinkEventUtilTest, TouchEventCoalescing) {
+  blink::WebTouchPoint touchPoint;
+  touchPoint.id = 1;
+  touchPoint.state = blink::WebTouchPoint::StateMoved;
+
+  blink::WebTouchEvent coalesced_event;
+  coalesced_event.setType(blink::WebInputEvent::TouchMove);
+  touchPoint.movementX = 5;
+  touchPoint.movementY = 10;
+  coalesced_event.touches[coalesced_event.touchesLength++] =
+      touchPoint;
+
+  blink::WebTouchEvent event_to_be_coalesced;
+  event_to_be_coalesced.setType(blink::WebInputEvent::TouchMove);
+  touchPoint.movementX = 3;
+  touchPoint.movementY = -4;
+  event_to_be_coalesced.touches[event_to_be_coalesced.touchesLength++] =
+      touchPoint;
+
+  EXPECT_TRUE(CanCoalesce(event_to_be_coalesced, coalesced_event));
+  Coalesce(event_to_be_coalesced, &coalesced_event);
+  EXPECT_EQ(8, coalesced_event.touches[0].movementX);
+  EXPECT_EQ(6, coalesced_event.touches[0].movementY);
+
+}
+
 }  // namespace ui