Whitelist mb files for 'mb analyze', fix Android GN test targets.

Whitelist mb files for 'mb analyze', fix Android GN test targets.

If one of the tools/mb files changes, mb analyze may not produce
correct results (since the configs might change), so we should
just build everything.

Also, fix a dangling target for the android_gn trybot.

TBR=phajdan.jr@chromium.org
BUG=454413
Committed: https://crrev.com/94a945cc60ea5ecc1f20252684589e1e7c6295b5
Cr-Commit-Position: refs/heads/master@{#325376}

[Dirk Pranke, 2015-04-15 22:54:17]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-04-15 22:55:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1092523002/1

[Paweł Hajdan Jr., 2015-04-15 23:51:19]

LGTM

FWIW it seems this could be done in two separate patches as the two things seem
orthogonal.

[commit-bot: I haz the power, 2015-04-16 02:14:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 02:15:35]

Patchset 1 (id:??) landed as
https://crrev.com/94a945cc60ea5ecc1f20252684589e1e7c6295b5
Cr-Commit-Position: refs/heads/master@{#325376}