Use Window coordinates for IME composition bounds, auto resize, pepper's selection bounds.

BUG=485650
TEST=covered by unit tests.

Committed: https://crrev.com/3d09c3fa33ff2d2a8fd85c9cc71f0faf1f3fbe05
Cr-Commit-Position: refs/heads/master@{#364911}

Review URL: https://codereview.chromium.org/1496243005

Cr-Commit-Position: refs/heads/master@{#365072}
4 files changed