🎱 Add test runner scripts for instrumentation tests

talk/build/common.gypi

 #
 # libjingle
 # Copyright 2012 Google Inc.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 #  1. Redistributions of source code must retain the above copyright notice,
 #     this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 11 matching lines @@
 # OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 # OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 
 # This file contains common settings for building libjingle components.
 
 {
   'variables': {
-    'webrtc_root%': '<(DEPTH)/webrtc',
+    'variables': {

[kjellander_webrtc, 2016/04/07 07:57:12]

I don't think you need any changes in this file. It shouldn't be referenced
outside the talk/ folder, which is something we're trying to get rid of entirely
(as soon we have a replacement for the legacy objC APIs that still live in
there).

If you need these changes, they should be in webrtc/build/common.gypi.
I was able to patch your CL, remove the changes in talk/build/common.gypi,
generate projects for Android and build everything.
With that, I got runner scripts for libjingle_peerconnection_android_unittest
and AppRTCDemoTest generated in out/Release/bin

[agrieve, 2016/04/07 13:32:23]

Sorry, should have pointed out why I did this, as it really wasn't obvious.

The issue is that webrtc/webrtc_examples.gyp includes talk/build/common.gypi
rather than webrtc/build/common.gypi. Including both common.gypis resulted in a
GYP error, and switching to webrtc/build/common.gypi resulted in build failures
(lint warnings). 

I've updated it now to just set the test_runner_path on the target within
webrtc_examples.gyp

[kjellander_webrtc, 2016/04/07 17:56:14]

Oh, I wasn't aware of this. I really should spend some time getting rid of the
last parts of talk/build/common.gypi then.
This sounded like the way to go, but when I tested this (with a checkout that
had https://codereview.webrtc.org/1866123002 synced) I see only see the
generated script for AppRTCDemoTest get the right path: 
$ grep -r test_runner.py out/Release/bin/
out/Release/bin/run_audio_decoder_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_common_audio_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_test_support_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_modules_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_tools_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_webrtc_nonparallel_tests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_rtc_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_voice_engine_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_libjingle_peerconnection_android_unittest:  test_runner_path
= ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_system_wrappers_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_common_video_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_AppRTCDemoTest:  test_runner_path =
ResolvePath('../../../webrtc/build/android/test_runner.py')
out/Release/bin/run_modules_tests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_webrtc_perf_tests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_video_engine_tests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_audio_codec_speed_tests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')
out/Release/bin/run_peerconnection_unittests:  test_runner_path =
ResolvePath('../../../build/android/test_runner.py')

I suspect that the variable set in https://codereview.webrtc.org/1866123002 is
not in the right variable scope (classic GYP mess).

+      'webrtc_root%': '<(DEPTH)/webrtc',
+    },
+    'webrtc_root%': '<(webrtc_root)',
     # TODO(ronghuawu): For now, disable the Chrome plugins, which causes a
     # flood of chromium-style warnings.
     'clang_use_chrome_plugins%': 0,
     # Disable these to not build components which can be externally provided.
     'build_json%': 1,
+    'test_runner_path': '<(webrtc_root)/build/android/test_runner.py',
   },
   'target_defaults': {
     'include_dirs': [
       '<(DEPTH)',
       '../..',
       '../../third_party',
       '../../third_party/webrtc',
       '../../webrtc',
     ],
     'conditions': [
@@ skipping 70 matching lines @@
           'HASH_NAMESPACE=__gnu_cxx',
           'WEBRTC_POSIX',
           'DISABLE_DYNAMIC_CAST',
           # The POSIX standard says we have to define this.
           '_REENTRANT',
         ],
       }],
     ],
   }, # target_defaults
 }