restarting adb server before each testing start will cause conflict for multiple emulators

build/android/run_tests.py

Index: build/android/run_tests.py
diff --git a/build/android/run_tests.py b/build/android/run_tests.py
index d13f7e90540370736133cda026bb2758a1dba5b5..e204a8122f47de7ff4c7959f104ccf1b52112405 100755
--- a/build/android/run_tests.py
+++ b/build/android/run_tests.py
@@ -337,6 +337,9 @@ def _RunATestSuite(options):
     # Wait for all emulators to boot completed.
     map(lambda buildbot_emulator: buildbot_emulator.ConfirmLaunch(True),
         buildbot_emulators)
+    # Restart adb server as emulator will reset connection when booting,
+    # which will break the connection between adb server and emulator.

[bulach, 2012/07/17 10:26:08]

the comment seems to indicate this is needed per emulator.. perhaps something
like this in 337:
def WaitForEmulatorAndRestartAdb(emulator):
  emulator.ConfirmLaunch(True)
  android_commands.RestartAdbServer()
map(WaitForEmulatorAndRestartAdb, buildbot_emulators)

[John Grabowski, 2012/07/17 18:09:22]

agree

[Wei James(wistoch), 2012/07/20 04:07:01]

after applying several patches of bulach, I run the tests for several times, it
is stable even without this one. 
As we already handle the connection lost issue in
AndroidCommand::WaitForSystemBootCompleted, I think removing it here is ok. 

+    android_commands.RestartAdbServer()
   elif options.test_device:
     attached_devices = [options.test_device]
   else: