EME: Handle NO_KEY and resume playback after key is added.

EME: Handle NO_KEY and resume playback after key is added.

- Now we can notify demuxer ready as soon as the demuxer is ready. We don't need
  to wait for a key to be added if the stream is encrypted.
- QueueSeureInputBuffer() et al return MediaCodecStatus to pass detailed status.
- If no key is available the media pipeline pauses.
- After a key is added we try to resume the media pipeline playback.

BUG=277211, 255781, 281663
TEST=Start decoding without key is added and see no crash. After key is added
playback resumes.

R=acolwell@chromium.org, jschuh@chromium.org, qinmin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=221331

[xhwang, 2013-09-04 20:22:32]

qinmin, acolwell: PTAL!

jschuh: Please OWNER review
content/common/media/media_player_messages_android.h.

[qinmin, 2013-09-04 20:39:11]

lgtm

[acolwell GONE FROM CHROMIUM, 2013-09-04 20:45:46]

lgtm

[jschuh, 2013-09-04 22:17:39]

ipc security lgtm. appears to just be removing gtv attack surface from normal
android.

[commit-bot: I haz the power, 2013-09-04 22:44:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/xhwang@chromium.org/23545029/1

[commit-bot: I haz the power, 2013-09-04 23:11:08]

Sorry for I got bad news for ya.
Compile failed with a clobber build on ios_dbg_simulator.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_dbg_si...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-09-04 23:19:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/xhwang@chromium.org/23545029/1

[commit-bot: I haz the power, 2013-09-04 23:27:35]

Sorry for I got bad news for ya.
Compile failed with a clobber build on ios_dbg_simulator.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_dbg_si...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-09-05 01:10:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/xhwang@chromium.org/23545029/24001

[commit-bot: I haz the power, 2013-09-05 02:16:44]

Retried try job too often on ios_dbg_simulator for step(s) ui_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_dbg_si...

[xhwang, 2013-09-05 02:21:57]

Committed patchset #2 manually as r221331 (presubmit successful).