Fix MediaPlayerBridge to handle unknown or infinite durations.

Fix MediaPlayerBridge to handle unknown or infinite durations.

The Android MediaPlayer API says it will return -1 for the duration
if it is unknown:

http://developer.android.com/reference/android/media/MediaPlayer.html#getDuration()

The Chrome media pipeline expects this to be presented as
media::kInfiniteDuration() when in TimeDelta format.

BUG=none
TEST=none

Committed: https://crrev.com/a417a417a23c24bbc0136e069ad93a945b15ba66
Cr-Commit-Position: refs/heads/master@{#297556}

[DaleCurtis, 2014-09-30 22:14:05]

dalecurtis@chromium.org changed reviewers:
+ qinmin@chromium.org

[DaleCurtis, 2014-09-30 22:14:06]

I guess
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...
isn't running on Android?

[qinmin, 2014-09-30 22:29:12]

lgtm. There is no bots running layout tests when I checked it several weeks ago,
not sure whether what causes that

[DaleCurtis, 2014-09-30 23:24:34]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2014-09-30 23:26:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/617743004/1

[commit-bot: I haz the power, 2014-10-01 00:20:36]

Committed patchset #1 (id:1) as e60d25dec9d47a926053cae8c3bf6045653019ed

[commit-bot: I haz the power, 2014-10-01 00:21:18]

Patchset 1 (id:??) landed as
https://crrev.com/a417a417a23c24bbc0136e069ad93a945b15ba66
Cr-Commit-Position: refs/heads/master@{#297556}