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BUG: 11001058

Webview does not use ProactiveBeginFrame, so cannot depend on BeginFrame
for activation.

Note that this patch as is cannot land in upstream Chromium since all
other platforms do use ProactiveBeginFrame.

Forking since Chromium trunk looks very different so fixes there cannot
be cherry-picked now.

Change-Id: I6a6e2e6f9dcfc7b29d0af2e0f04e2e042610380e