[Media, Android] Always explicitly set the notification play/pause button visibility

[Media, Android] Always explicitly set the notification play/pause button visibility

Also moved the code forming the content view into createContentView().

BUG=541629
Committed: https://crrev.com/b8815dd550cb323516daf7c24ec531d3b8651c31
Cr-Commit-Position: refs/heads/master@{#356912}

[whywhat, 2015-10-29 13:05:52]

avayvod@chromium.org changed reviewers:
+ mlamouri@chromium.org

[whywhat, 2015-10-29 13:05:53]

PTaL

[mlamouri (slow - plz ping), 2015-10-29 18:40:40]

The CQ bit was checked by mlamouri@chromium.org

[mlamouri (slow - plz ping), 2015-10-29 18:40:41]

lgtm

[commit-bot: I haz the power, 2015-10-29 18:41:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1424793006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1424793006/1

[commit-bot: I haz the power, 2015-10-29 19:30:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-29 19:31:48]

Patchset 1 (id:??) landed as
https://crrev.com/b8815dd550cb323516daf7c24ec531d3b8651c31
Cr-Commit-Position: refs/heads/master@{#356912}