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Although PIP windows are not supposed to be resized by Chrome,
because of vaious off-by-one issues, some bounds move events for
PIP windows are currently considered to be
BOUNDS_CHANGE_REASON_RESIZE, and Android rejects those events as
the window is already in PIP.

BUG=b:171361297
TEST=Manually confirmed the bounds of PIP matches between Android and Chrome

Change-Id: I62d2909f32143e5369587de2ea8abf5748b82233
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488263
Commit-Queue: Kazuki Takise <takise@chromium.org>
Auto-Submit: Kazuki Takise <takise@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819802}