[Android] Allow gtests to pull app data off the device before clearing it.

build/android/pylib/device/device_utils_test.py

Index: build/android/pylib/device/device_utils_test.py
diff --git a/build/android/pylib/device/device_utils_test.py b/build/android/pylib/device/device_utils_test.py
index 317e81e83b619ea83afa8b93c9cab6767a8c1159..ca097b79c9b067253090876b4627d8c40ac11d17 100755
--- a/build/android/pylib/device/device_utils_test.py
+++ b/build/android/pylib/device/device_utils_test.py
@@ -336,6 +336,25 @@ class DeviceUtilsGetApplicationPathTest(DeviceUtilsTest):
         self.device.GetApplicationPath('android')
 
 
+class DeviceUtilsGetApplicationDataDirectoryTest(DeviceUtilsTest):
+
+  def testGetApplicationDataDirectory_exists(self):
+    with self.assertCall(
+        self.call.device._RunPipedShellCommand(
+            'pm dump foo.bar.baz | grep dataDir='),
+        ['dataDir=/data/data/foo.bar.baz']):
+      self.assertEquals(
+          '/data/data/foo.bar.baz',
+          self.device.GetApplicationDataDirectory('foo.bar.baz'))
+
+  def testGetApplicationDataDirectory_notExists(self):
+    with self.assertCall(
+        self.call.device._RunPipedShellCommand(
+            'pm dump foo.bar.baz | grep dataDir='),
+        self.ShellError()):
+      self.assertIsNone(self.device.GetApplicationDataDirectory('foo.bar.baz'))
+
+
 @mock.patch('time.sleep', mock.Mock())
 class DeviceUtilsWaitUntilFullyBootedTest(DeviceUtilsTest):