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

build/android/pylib/android_commands.py

Index: build/android/pylib/android_commands.py
diff --git a/build/android/pylib/android_commands.py b/build/android/pylib/android_commands.py
index de211d8112b7a7afdfe4853fddee0ac06feef3d6..da87f39f4dae86130a6507681404fa322fc808f0 100644
--- a/build/android/pylib/android_commands.py
+++ b/build/android/pylib/android_commands.py
@@ -84,6 +84,13 @@ def GetEmulators():
   return devices
 
 
+def GetAVDs():
+  """Returns a list of AVDs."""
+  re_avd = re.compile('^[ ]+Name: ([a-zA-Z0-9_:.-]+)', re.MULTILINE)
+  avds = re_avd.findall(cmd_helper.GetCmdOutput(['android', 'list', 'avd']))
+  return avds
+
+
 def GetAttachedDevices():
   """Returns a list of attached, online android devices.