Allow location of test_runner.py to be overriden in GYP

Required for webrtc

BUG=599919

Review URL: https://codereview.chromium.org/1868723002

Cr-Original-Commit-Position: refs/heads/master@{#385563}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a490637d06294d400b0e6496642fc2fbcc974538

android/gyp/create_test_runner_script.py

@@ -50,6 +50,8 @@ def main(args):
   parser.add_argument('--depfile',
                       help='Path to the depfile. This must be specified as '
                            "the action's first output.")
+  parser.add_argument('--test-runner-path',
+                      help='Path to test_runner.py (optional).')
   # We need to intercept any test runner path arguments and make all
   # of the paths relative to the output script directory.
   group = parser.add_argument_group('Test runner path arguments.')
@@ -70,7 +72,7 @@ def main(args):
     """Returns the path relative to the output script directory."""
     return os.path.relpath(path, os.path.dirname(args.script_output_path))
 
-  test_runner_path = os.path.join(
+  test_runner_path = args.test_runner_path or os.path.join(
       os.path.dirname(__file__), os.path.pardir, 'test_runner.py')
   test_runner_path = RelativizePathToScript(test_runner_path)
 

android/test_runner.gypi

@@ -43,6 +43,7 @@
     'variables': {
       'additional_apks%': [],
       'isolate_file%': '',
+      'test_runner_path%': '',
     },
     'test_runner_args': ['--output-directory', '<(PRODUCT_DIR)'],
     'conditions': [
@@ -74,6 +75,9 @@
       ['isolate_file != ""', {
         'test_runner_args': ['--isolate-file-path', '<(isolate_file)']
       }],
+      ['test_runner_path != ""', {
+        'test_runner_args': ['--test-runner-path', '<(test_runner_path)']
+      }],
     ],
   },
   'actions': [