Hide the PopupTouchHandlerDrawable if it is occluded.

Hide the PopupTouchHandlerDrawable if it is occluded.

This CL follows Android Editor's logic to determine if the touch handler is
visible by going up the view hierarchy. If the touch handler is fully occluded
by any of its parent views, then it is considered not visible.

In this way, the touch handlers won't appear overlapped with the IME window, if
the app adjusts the window size based on IME window.

BUG=639169
Review-Url: https://codereview.chromium.org/2410223003
Cr-Commit-Position: refs/heads/master@{#424896}
(cherry picked from commit 4a64446000115cca6deba65288de86741a40062e)

Committed: https://chromium.googlesource.com/chromium/src/+/afe45453fc54d87bbec43ce683358d43fbb44ef0

[hush (inactive), 2016-10-13 00:02:39]

Description was changed from

==========
Hide the PopupTouchHandlerDrawable if it is occluded.

This CL follows Android Editor's logic to determine if the touch handler is
visible by going up the view hierarchy. If the touch handler is fully occluded
by any of its parent views, then it is considered not visible.

In this way, the touch handlers won't appear overlapped with the IME window, if
the app adjusts the window size based on IME window.

BUG=639169

Review-Url: https://codereview.chromium.org/2410223003
Cr-Commit-Position: refs/heads/master@{#424896}
(cherry picked from commit 4a64446000115cca6deba65288de86741a40062e)
==========

to

==========
Hide the PopupTouchHandlerDrawable if it is occluded.

This CL follows Android Editor's logic to determine if the touch handler is
visible by going up the view hierarchy. If the touch handler is fully occluded
by any of its parent views, then it is considered not visible.

In this way, the touch handlers won't appear overlapped with the IME window, if
the app adjusts the window size based on IME window.

BUG=639169

Review-Url: https://codereview.chromium.org/2410223003
Cr-Commit-Position: refs/heads/master@{#424896}
(cherry picked from commit 4a64446000115cca6deba65288de86741a40062e)

Committed:
https://chromium.googlesource.com/chromium/src/+/afe45453fc54d87bbec43ce68335...
==========

[hush (inactive), 2016-10-13 00:02:40]

Committed patchset #1 (id:1) manually as
afe45453fc54d87bbec43ce683358d43fbb44ef0.