Fix ScreenCapturerWinGdi to handle DesktopFrameWin::Create() errors.

Fix ScreenCapturerWinGdi to handle DesktopFrameWin::Create() errors.

DesktopFrameWin::Create() may return nullptr when it fails to allocate
windows bitmap. ScreenCapturerWinGdi wasn't handling that case properly.

BUG=527660
Committed: https://crrev.com/d5ae6ae6b5599fb47a17656ec092ff923609a8d2
Cr-Commit-Position: refs/heads/master@{#9865}

[Sergey Ulanov, 2015-09-04 20:30:06]

Patchset #1 (id:1) has been deleted

[Sergey Ulanov, 2015-09-04 20:30:14]

sergeyu@chromium.org changed reviewers:
+ jiayl@chromium.org

[jiayl, 2015-09-04 20:35:30]

lgtm

[Sergey Ulanov, 2015-09-04 20:57:41]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-09-04 20:57:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1309143007/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1309143007/20001

[commit-bot: I haz the power, 2015-09-04 20:57:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-04 20:57:51]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[jiayl2, 2015-09-04 20:58:55]

jiayl@webrtc.org changed reviewers:
+ jiayl@webrtc.org

[jiayl2, 2015-09-04 20:58:55]

lgtm

[Sergey Ulanov, 2015-09-04 20:59:06]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-09-04 20:59:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1309143007/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1309143007/20001

[commit-bot: I haz the power, 2015-09-04 22:59:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-04 22:59:30]

Try jobs failed on following builders:
  android on tryserver.webrtc (JOB_TIMED_OUT, no build URL)

[Sergey Ulanov, 2015-09-05 01:37:14]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-09-05 01:37:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1309143007/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1309143007/20001

[commit-bot: I haz the power, 2015-09-05 01:38:12]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-09-05 01:38:25]

Patchset 1 (id:??) landed as
https://crrev.com/d5ae6ae6b5599fb47a17656ec092ff923609a8d2
Cr-Commit-Position: refs/heads/master@{#9865}