Add Instrumentation test support to remote device

This is the minimum to trigger/collect instrumentation tests.
There is still more to be done before this is working 100%.

BUG=448627

Review URL: https://codereview.chromium.org/832493005

Cr-Commit-Position: refs/heads/master@{#312457}
diff --git a/build/android/test_runner.py b/build/android/test_runner.py
index e92f851..4164bd8b 100755
--- a/build/android/test_runner.py
+++ b/build/android/test_runner.py
@@ -142,7 +142,7 @@
                      help='Type of test to run as.')
   group.add_argument('--runner-package', default='',
                      help='Package name of test.')
-  group.add_argument('--apk-under-test', default='apks/Chrome.apk',
+  group.add_argument('--app-under-test', default='',
                      help='APK to run tests on.')
 
   api_secret_group = group.add_mutually_exclusive_group()
@@ -316,6 +316,7 @@
 
   AddCommonOptions(parser)
   AddDeviceOptions(parser)
+  AddRemoteDeviceOptions(parser)
 
 
 def ProcessInstrumentationOptions(args):