🎱 Add test runner scripts for instrumentation tests

talk/build/common.gypi

Index: talk/build/common.gypi
diff --git a/talk/build/common.gypi b/talk/build/common.gypi
index 4ee78f1c472cc8438b963e0d27dcfe73cf7a5daa..491e4f5236b1a816ac5cc54851ae59e791b07aa1 100644
--- a/talk/build/common.gypi
+++ b/talk/build/common.gypi
@@ -29,12 +29,16 @@
 
 {
   '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': [