Reason for revert:
Misses deps for RTC_HISTOGRAM in Chrome.
email sent separately.
Also see https://codereview.chromium.org/2725143004/.
Original issue's description:
> BlankDetectorDesktopCapturerWrapper to detect a blank DesktopFrame
>
> DXGI capturer highly depends on video adapter and its driver, as well as Windows
> itself. I recently found it cannot work on my virtualbox instance any more,
> which indicates it may not work well on some specific systems. What worse is,
> the APIs do not return a failure in such case.
>
> So this change adds a BlankDetectorDesktopCapturerWrapper, which samples several
> pixels in the frame returned by a DesktopCapturer implementation. If all the
> pixels selected are blank, this wrapper returns a failure. A typical usage is to
> combine BlankDetectorDesktopCapturerWrapper with FallbackDesktopCapturerWrapper,
> and use GDI capturer in case of failure.
>
> Usually less than 500 pixels are checked, so the
> BlankDetectorDesktopCapturerWrapper should not impact the capturer performance.
>
> This change is expected to resolve bug 682112 in another dimension.
>
> BUG=682112
>
> Review-Url: https://codereview.webrtc.org/2709523003
> Cr-Commit-Position: refs/heads/master@{#16984}
> Committed: c4e9d210b3TBR=sergeyu@chromium.org,zijiehe@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=682112
Review-Url: https://codereview.webrtc.org/2726983005
Cr-Commit-Position: refs/heads/master@{#16993}
528a834ef0