Let adb_gdb support privileged processes with a switch.

Let adb_gdb support privileged processes with a switch.

Add "--privileged" and "--privileged=<num>" that works similar to
"--sandboxed" to make it easier to debug the GPU process on Android.

BUG=468697
Committed: https://crrev.com/c0d04ee2e6d53f043b5da00e98c724cdd6e2a8fa
Cr-Commit-Position: refs/heads/master@{#321351}

[peterp, 2015-03-19 10:41:48]

peterp@opera.com changed reviewers:
+ jbudorick@chromium.org

[peterp, 2015-03-19 10:42:38]

jbudorick: Does this look okay?

[jbudorick, 2015-03-19 13:22:18]

lgtm

[peterp, 2015-03-19 13:29:27]

The CQ bit was checked by peterp@opera.com

[commit-bot: I haz the power, 2015-03-19 13:29:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1023703002/1

[commit-bot: I haz the power, 2015-03-19 13:56:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-19 13:56:38]

Patchset 1 (id:??) landed as
https://crrev.com/c0d04ee2e6d53f043b5da00e98c724cdd6e2a8fa
Cr-Commit-Position: refs/heads/master@{#321351}