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A common behavior on Android is for the user to press home or recents
button accidently and get back to the app. This behavior would cause
Chrome to clear the contexts and recreate which is a waste of time. So,
add a 5 second delay before clearing the context.
As a side effect, this delay also considerably lowers the risk of the
renderers initializing the GPU command buffer after clearing since they
usually receive the "not-visible" message within 5 seconds.

BUG=725303

Change-Id: I7d2655c75b66cf073b82c270baa3f1f3b27b3a8a
Reviewed-on: https://chromium-review.googlesource.com/571294
Commit-Queue: Siddhartha S <ssid@chromium.org>
Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487539}