Mojo: Send Android args in a string array, not JSON.

Use adb shell am's comma-separated --esa argument.
(escape commas in the script and un-escape them in Java)

John was hitting a JSON parsing error/crash locally.
This should circumvent that error and reduce complexity.

TEST=Android Mojo and Mandoline still works as expected.,

Review URL:

Cr-Commit-Position: refs/heads/master@{#333018}
2 files changed