WebRTC: Add android_junit_tests.

scripts/slave/recipe_modules/webrtc/builders.py

Index: scripts/slave/recipe_modules/webrtc/builders.py
diff --git a/scripts/slave/recipe_modules/webrtc/builders.py b/scripts/slave/recipe_modules/webrtc/builders.py
index 97cd7059b21d2d9ec082df616eaf686345e28fa6..d19eaa584219446714e3e1bf9f8952a43b6be8e3 100644
--- a/scripts/slave/recipe_modules/webrtc/builders.py
+++ b/scripts/slave/recipe_modules/webrtc/builders.py
@@ -402,6 +402,11 @@ BUILDERS = freeze({
           'Android32 Tests (L Nexus7.2)',
         ],
         'archive_apprtc': True,
+        'additional_tests': {
+          'android_tests': [
+            'android_junit_tests',
+          ]
+        }
       },
       'Android32 Builder (dbg)': {
         'recipe_config': 'webrtc_android',
@@ -656,6 +661,11 @@ BUILDERS = freeze({
         'swarming_dimensions': {
           'os': 'Android',
           'device_type': 'bullhead', # Nexus 5X
+        },
+        'additional_tests': {
+          'android_tests': [
+            'android_junit_tests',
+          ]
         }
       },
       'Android32 ASan (L Nexus6)': {