sergeyu 0786c04f97 Fix crash in XServerPixelBuffer.
XServerPixelBuffer contains x_image_ field, that may be allocated using
XGetImage() or XShmCreateImage() depending how the last frame was captured.
x_image_ is passed XShmGetImage(), which may crash if it gets image
allocated with XGetImage(). Added x_shm_image_ to ensure that SHM and
non-SHM capture paths are separate and XShmGetImage() is allways called
with the correct XImage.

The linked bug appears to be a regressiona after
https://codereview.webrtc.org/2044693002

BUG=chromium:697823

Review-Url: https://codereview.webrtc.org/2796673002
Cr-Commit-Position: refs/heads/master@{#17518}
2017-04-04 01:08:08 +00:00
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