Fix backdrop-filter bounds for transforms

Prior to this CL, transforms applied to the element with
backdrop-filter were not properly applied to the backdrop
filter bounds (clipping) rect. This should be fixed by
this CL. This should also fix some issues related to
high DPI screens with device_scale_factor != 1.

Bug: 944388, 957311

Change-Id: I375492d1f6b8d7a1acdc41401f2c00cfeb32d4ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1521959
Reviewed-by: enne <[email protected]>
Reviewed-by: ccameron <[email protected]>
Commit-Queue: Mason Freed <[email protected]>
Auto-Submit: Mason Freed <[email protected]>
Cr-Commit-Position: refs/heads/master@{#655890}
7 files changed