Workaround for package-private framework tests in runtest.

Checks if the test to run is a framework test based on path, and if so
disables the davlik verifier by writing to /data/local.prop and
rebooting device.

Change-Id: Ibf94fb921662b5ddf6136dd12360d5de83a3a284

testrunner/adb_interface.py

@@ -148,6 +148,19 @@ class AdbInterface:
       return False
     return True
 
+  def EnableAdbRoot(self):
+    """Enable adb root on device."""
+    output = self.SendCommand("root")
+    if "adbd is already running as root" in output:
+      return True
+    elif "restarting adbd as root" in output:
+      # device will disappear from adb, wait for it to come back
+      self.SendCommand("wait-for-device")
+      return True
+    else:
+      logger.Log("Unrecognized output from adb root: %s" % output)
+      return False
+
   def StartInstrumentationForPackage(
       self, package_name, runner_name, timeout_time=60*10,
       no_window_animation=False, instrumentation_args={}):