Use the window coordinate for the autofill bounds.

Viewport and Window coordinates will differ when Zoom is used to implement DSF behavior.

BUG=485650
TEST=RenderViewImplScaleFactorTest.*, plus manually tested.

Review URL: https://codereview.chromium.org/1455143004

Cr-Commit-Position: refs/heads/master@{#363134}
7 files changed