[Android] Break GTest emulator launching into a separate function.

build/android/pylib/utils/emulator.py

Index: build/android/pylib/utils/emulator.py
diff --git a/build/android/emulator.py b/build/android/pylib/utils/emulator.py
similarity index 91%
copy from build/android/emulator.py
copy to build/android/pylib/utils/emulator.py
index 0cbe4c946c5c9a30a86528446acec25f7b506500..70afffb2efc2cbe011bb36b21ff3680c6f5c9f6f 100755
--- a/build/android/emulator.py
+++ b/build/android/pylib/utils/emulator.py
@@ -19,6 +19,8 @@ import subprocess
 import sys
 import time
 
+import time_profile
+# TODO(craigdh): Move these pylib dependencies to pylib/utils/.
 from pylib import android_commands
 from pylib import cmd_helper
 
@@ -99,8 +101,36 @@ def _GetAvailablePort():
       return port
 
 
+def LaunchEmulators(emulator_count, wait_for_boot=True):
+  """Launch multiple emulators and wait for them to boot.
+
+  Args:
+    emulator_count: number of emulators to launch.
+
+  Returns:
+    List of emulators.
+  """
+  emulators = []
+  for n in xrange(emulator_count):
+    t = time_profile.TimeProfile('Emulator launch %d' % n)
+    avd_name = None
+    if n > 0:
+      # Creates a temporary AVD for the extra emulators.
+      avd_name = 'run_tests_avd_%d' % n
+    logging.info('Emulator launch %d with avd_name=%s', n, avd_name)
+    emulator = Emulator(avd_name)
+    emulator.Launch(kill_all_emulators=n == 0)
+    t.Stop()
+    emulators.append(emulator)
+  # Wait for all emulators to boot completed.
+  if wait_for_boot:
+    for emulator in emulators:
+      emulator.ConfirmLaunch(True)
+  return emulators
+
+
 class Emulator(object):
-  """Provides the methods to lanuch/shutdown the emulator.
+  """Provides the methods to launch/shutdown the emulator.
 
   The emulator has the android virtual device named 'avd_armeabi'.
 
@@ -306,10 +336,3 @@ class Emulator(object):
     """Install a handler to kill the emulator when we exit unexpectedly."""
     for sig in self._SIGNALS:
       signal.signal(sig, self._ShutdownOnSignal)
-
-def main(argv):
-  Emulator(None, True).Launch(True)
-
-
-if __name__ == '__main__':
-  main(sys.argv)