[Android] Fixes for instrumentation in platform mode.

[Android] Fixes for instrumentation in platform mode.

https://codereview.chromium.org/794923003/ had a few problems:
 - it broke uiautomator test output parsing
 - it had a typo in InstrumentationTestInstance
 - it had an error in how it handles instrumentation's test dict objects

BUG=428729
Committed: https://crrev.com/a4dac37b42fa1aa2e02073e00dc55e70159268d0
Cr-Commit-Position: refs/heads/master@{#311575}

[jbudorick, 2015-01-14 20:37:13]

jbudorick@chromium.org changed reviewers:
+ klundberg@chromium.org, rnephew@chromium.org

[klundberg, 2015-01-14 21:39:33]

LGTM after John in person explained how the various method is overwritten in
various places.

[jbudorick, 2015-01-14 21:40:54]

The CQ bit was checked by jbudorick@chromium.org

[commit-bot: I haz the power, 2015-01-14 21:41:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/854733002/1

[commit-bot: I haz the power, 2015-01-14 23:53:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-14 23:54:56]

Patchset 1 (id:??) landed as
https://crrev.com/a4dac37b42fa1aa2e02073e00dc55e70159268d0
Cr-Commit-Position: refs/heads/master@{#311575}