Add logging to LegacyRenderWidgetHostHWND for DirectManipulation not working issue

Microsoft folks suspected Chrome does not polling the event properly. In this patch,
I added a log checking if AnimationObserverForDirectManipulation create at
DM_POINTERHITTEST and destroy at animation end.

Bug: 914914
Change-Id: Ie45b5422dd08455bff83d494ade6b062eb306368
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1506433
Commit-Queue: Jianpeng Chao <chaopeng@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639102}
2 files changed