Remove PlatformWheelEvent and use WebMouseWheelEvent instead

third_party/WebKit/Source/platform/WebMouseWheelEvent.cpp

+// 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 "public/platform/WebMouseWheelEvent.h"
+
+namespace blink {
+
+float WebMouseWheelEvent::deltaXInRootFrame() const {
+  return deltaX / m_frameScale;
+}
+
+float WebMouseWheelEvent::deltaYInRootFrame() const {
+  return deltaY / m_frameScale;
+}
+
+WebMouseWheelEvent WebMouseWheelEvent::flattenTransform() const {
+  WebMouseWheelEvent result = *this;
+  result.deltaX /= result.m_frameScale;
+  result.deltaY /= result.m_frameScale;

[majidvp, 2016/12/20 17:30:14]

I think this should also flatten movement{X,Y}.

Perhaps a better way to do this to have WebMouseEvent have its own
flattenTransform
method which we invoke to handle movement and x modifications.

BTW, are we missing a test here for this flatten functionality?

[dtapuska, 2017/01/03 20:19:14]

I've added a FlattenTransformSelf on mouse event that flattens the object
itself.

It should be tested in the WebInputEventConversionTest.cpp

+  result.x = (result.x / result.m_frameScale) + result.m_frameTranslate.x;
+  result.y = (result.y / result.m_frameScale) + result.m_frameTranslate.y;
+  result.m_frameTranslate.x = 0;
+  result.m_frameTranslate.y = 0;
+  result.m_frameScale = 1;
+  return result;
+}
+
+}  // namespace blink