Report new screen position to renderer when ancestor window moves.

This change is related to https://codereview.chromium.org/1062273002/.
Without it renderer can draw controls (dropdowns, etc.) out of place,
because it will have outdated screen coordinates.

BUG=469857, 468669

Review URL: https://codereview.chromium.org/1143323009

Cr-Commit-Position: refs/heads/master@{#333749}
2 files changed