WebRTC: Save logcat output to isolated outputs.

NOTRY=True
BUG=chromium:717417

Review-Url: https://codereview.webrtc.org/3008343002
Cr-Commit-Position: refs/heads/master@{#19748}
diff --git a/tools_webrtc/mb/mb.py b/tools_webrtc/mb/mb.py
index 9c92c28..8e57d39 100755
--- a/tools_webrtc/mb/mb.py
+++ b/tools_webrtc/mb/mb.py
@@ -1057,7 +1057,10 @@
     if android:
       cmdline = ['../../build/android/test_wrapper/logdog_wrapper.py',
                  '--target', target,
-                 '--logdog-bin-cmd', '../../bin/logdog_butler']
+                 '--logdog-bin-cmd', '../../bin/logdog_butler',
+                 '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
+                 '--store-tombstones']
+
       if test_type != 'junit_test':
         cmdline += ['--target-devices-file', '${SWARMING_BOT_FILE}']
     else:
diff --git a/tools_webrtc/mb/mb_unittest.py b/tools_webrtc/mb/mb_unittest.py
index 56ce88c..e6518ed 100755
--- a/tools_webrtc/mb/mb_unittest.py
+++ b/tools_webrtc/mb/mb_unittest.py
@@ -381,7 +381,9 @@
         '../../build/android/test_wrapper/logdog_wrapper.py',
         '--target', 'base_unittests',
         '--logdog-bin-cmd', '../../bin/logdog_butler',
-        '--target-devices-file', '${SWARMING_BOT_FILE}'
+        '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
+        '--store-tombstones',
+        '--target-devices-file', '${SWARMING_BOT_FILE}',
     ])
 
   def test_gn_gen_swarming_android_junit_test(self):
@@ -413,6 +415,8 @@
         '../../build/android/test_wrapper/logdog_wrapper.py',
         '--target', 'base_unittests',
         '--logdog-bin-cmd', '../../bin/logdog_butler',
+        '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
+        '--store-tombstones',
     ])
 
   def test_gn_gen_non_parallel_console_test_launcher(self):