media: Implement MediaDrmBridge::SetServerCertificate().

media: Implement MediaDrmBridge::SetServerCertificate().

Also update MediaDrmBridge to use org.chromium.base.Log. See bug 472152.

BUG=487435, 472152
TEST=Tested using a test certificate. We only get one key request instead of two, and playback works.

Committed: https://crrev.com/4e0f76e75923b3aaed2ef071681cb041de17093e
Cr-Commit-Position: refs/heads/master@{#330665}

[xhwang, 2015-05-15 18:31:21]

xhwang@chromium.org changed reviewers:
+ ddorwin@chromium.org

[xhwang, 2015-05-15 18:31:22]

Still needs to find a way to test it. Otherwise, PTAL

[ddorwin, 2015-05-18 16:32:01]

lgtm

[xhwang, 2015-05-19 23:21:24]

The CQ bit was checked by xhwang@chromium.org

[commit-bot: I haz the power, 2015-05-20 00:22:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1145583003/1

[commit-bot: I haz the power, 2015-05-20 01:15:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-20 01:17:58]

Patchset 1 (id:??) landed as
https://crrev.com/4e0f76e75923b3aaed2ef071681cb041de17093e
Cr-Commit-Position: refs/heads/master@{#330665}