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PageHandler::ScreencastFrameCaptured creates a gfx::Image and uses it on
another sequence. However, the usage causes a data race as gfx::Image has
a non-threadsafe ref count internally, and its copies can't cross sequences. 

Bug: 600237, 725706
Change-Id: I645d529db1b8887b3c67f81a7916cdab0940b1d0
Reviewed-on: https://chromium-review.googlesource.com/513665Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Taiju Tsuiki (tzik) <tzik@google.com>
Cr-Commit-Position: refs/heads/master@{#474952}