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We used it to pass GraphicsContext from PageOverlay to
PageOverlay::Delegete implementors. Pass GraphicsContext directly.

Skip cache in InspectorOverlay because view painted for the overlay
may conflict with the view's real painting.

BUG=536999
R=chrishtr@chromium.org
TBR=dpranke@chromium.org (remove an extra include from src/components/test_runner.cc)

Review URL: https://codereview.chromium.org/1412593003

Cr-Commit-Position: refs/heads/master@{#357148}