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Adds content::AuraWindowVideoCaptureDevice, which provides screen
capture of aura::Windows that have compositor frame sinks associated
with them. Then, for Chrome OS browser window capture, where a CFS is
not available, use a fall-back window capturer impl instead. The
intention is for the LameWindowCapturerChromeOS to be a temporary
solution until more work is complete on services/ui/ws (the new Window
Service).

Note: This change does not activate the new impl yet. A follow-up
change will switch from the legacy impl to the new impl.

Bug: 806366
Change-Id: Ia6aa81e4addde603b120a6ab61c5e35a0041b418
Reviewed-on: https://chromium-review.googlesource.com/1006366
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Adam Parker <amp@chromium.org>
Reviewed-by: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559371}