Make WindowCapturerLinux handling window resize events. We need to re-initialize the XServerPixelBuffer to the new size when a window resize event is received.
Make WindowCapturerLinux handling window resize events.
We need to re-initialize the XServerPixelBuffer to the new size
when a window resize event is received.

BUG=https://code.google.com/p/chromium/issues/detail?id=339953
R=sergeyu@chromium.org, wez@chromium.org

Review URL: https://webrtc-codereview.appspot.com/8679004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@5578 4adac7df-926f-26a2-2b94-8c16560cd09d

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