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This feature is required for isInputPending.

The change to compositing_inputs_updater.cc fixes a bug that snuck in
via this CL while the feature was disabled:

https://chromium-review.googlesource.com/c/chromium/src/+/2283630

The web_test changes are mostly cases where a test has a cross-origin
iframe which was not previously composited, and making the iframe
composited caused anti-aliasing differences. The mhtml/ test changes
are needed because chromium treats the iframes in the encoded-html
test files as cross-origin; to ensure consistent text rendering, this
CL forces everything in both the test files and the ref test
expectations to be composited.

BUG=930987

Change-Id: I8f54eeacd333e46f394c08e9bf8366f0e9e2e57e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443630
Commit-Queue: Stefan Zager <szager@chromium.org>
Auto-Submit: Stefan Zager <szager@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815300}