Add --test-jar arg to test_runner to explicitly specify its path.

build/android/test_runner.py

Index: build/android/test_runner.py
diff --git a/build/android/test_runner.py b/build/android/test_runner.py
index f872ad0d5cda6e86ec6b1680f18188888f790824..a32d24ad8663cd0bfdbe84bbc66e31c5655b8183 100755
--- a/build/android/test_runner.py
+++ b/build/android/test_runner.py
@@ -346,6 +346,8 @@ def AddInstrumentationTestOptions(parser):
                      help='Path or name of the apk containing the tests '
                           '(name is without the .apk extension; '
                           'e.g. "ContentShellTest").')
+  group.add_argument('--test-jar',

[jbudorick, 2016/11/30 20:58:53]

(if this is going to be required, it should be marked as such here)

[mikecase (-- gone --), 2016/11/30 21:05:09]

It will only be required until CTS CL lands. But, I can mark it as required for
the time being.
Added required=True which will be removed in future CL.

[jbudorick, 2016/11/30 21:08:17]

ack. With you changing it in the CTS CL, this would be fine with me either way.

+                     help='Path of jar containing test java files.')
   group.add_argument('--test-apk-incremental-install-script',
                      type=os.path.realpath,
                      help='Path to install script for the --test-apk.')