aw: Force auxiliary bitmap on android emulators

aw: Force auxiliary bitmap on android emulators

Android emulators miss many EGL extensions required for
webview hardware accelerated rendering, so fallback to
a slow software mode when running in emulator.

BUG=490354
Committed: https://crrev.com/892c566fd38456475e8e58501f4f6c7373d82a3c
Cr-Commit-Position: refs/heads/master@{#330811}

[boliu, 2015-05-20 21:24:12]

boliu@chromium.org changed reviewers:
+ hush@chromium.org

[boliu, 2015-05-20 21:24:12]

ptal

[hush (inactive), 2015-05-20 21:31:49]

lgtm

[boliu, 2015-05-20 21:33:24]

The CQ bit was checked by boliu@chromium.org

[commit-bot: I haz the power, 2015-05-20 21:35:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1145273003/1

[commit-bot: I haz the power, 2015-05-20 21:42:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-20 21:43:37]

Patchset 1 (id:??) landed as
https://crrev.com/892c566fd38456475e8e58501f4f6c7373d82a3c
Cr-Commit-Position: refs/heads/master@{#330811}