The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/733e8096c00900e0051c42701760bdc374451b6b

commit 733e8096c00900e0051c42701760bdc374451b6b
Author: Ella Ge <eirage@chromium.org>
Date: Wed Nov 07 01:02:32 2018

remove frame_scale from movementX/Y

The pointerlock spec defines MovementX/Y follow the scale of
screenX/Y, which is not scaled by pinch-zoom scale.
https://w3c.github.io/pointerlock/#dom-mouseevent-movementx
Although currently in chrome, it is movement is in physical
pixel, it should still be unscaled value. We should not apply
frame_scale to movement_x/y.

Note that right now WebMouseEvent::MovementInRootFrame is not used
anywhere other than test. we only scales the touch PointerEvent
but not mouse event.

This CL removes unused WebMouseEvent::MovementInRootFrame, and also
makes touch pointer event movementX/Y not scaled by pinch zoom.

Bug:  837004 
Change-Id: I4bb39b3b01ecbd77c58fd4501a5c63ccb44e5a5b
Reviewed-on: https://chromium-review.googlesource.com/c/1313280
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605901}
[modify] https://crrev.com/733e8096c00900e0051c42701760bdc374451b6b/third_party/blink/public/platform/web_mouse_event.h
[modify] https://crrev.com/733e8096c00900e0051c42701760bdc374451b6b/third_party/blink/renderer/core/events/web_input_event_conversion_test.cc
[modify] https://crrev.com/733e8096c00900e0051c42701760bdc374451b6b/third_party/blink/renderer/core/input/pointer_event_manager_test.cc
[modify] https://crrev.com/733e8096c00900e0051c42701760bdc374451b6b/third_party/blink/renderer/platform/web_mouse_event.cc
[modify] https://crrev.com/733e8096c00900e0051c42701760bdc374451b6b/third_party/blink/renderer/platform/web_pointer_event.cc
[modify] https://crrev.com/733e8096c00900e0051c42701760bdc374451b6b/third_party/blink/renderer/platform/web_touch_event.cc