[Android log] Promote using hardcoded string tags

PRESUBMIT_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import glob
 import json
 import os
 import re
 import subprocess
@@ skipping 841 matching lines @@
     ]
 
     warnings = PRESUBMIT._CheckNoNewUtilLogUsage(
         mock_input_api, mock_output_api)
 
     self.assertEqual(1, len(warnings))
     self.assertEqual(2, len(warnings[0].items))
     self.assertTrue('HasAndroidLog.java' in warnings[0].items[0])
     self.assertTrue('HasExplicitLog.java' in warnings[0].items[1])
 
+  def testCheckAndroidCrLogUsage(self):
+    mock_input_api = MockInputApi()
+    mock_output_api = MockOutputApi()
+
+    mock_input_api.files = [
+      MockAffectedFile('RandomStuff.java', [
+        'random stuff'
+      ]),
+      MockAffectedFile('HasCorrectTag.java', [
+        'import org.chromium.base.Log;',
+        'some random stuff',
+        'private static final String TAG = "cr.Foo";',
+        'Log.d(TAG, "foo");',
+      ]),
+      MockAffectedFile('HasShortCorrectTag.java', [
+        'import org.chromium.base.Log;',
+        'some random stuff',
+        'private static final String TAG = "cr";',
+        'Log.d(TAG, "foo");',
+      ]),
+      MockAffectedFile('HasNoTagDecl.java', [
+        'import org.chromium.base.Log;',
+        'some random stuff',
+        'Log.d(TAG, "foo");',
+      ]),
+      MockAffectedFile('HasIncorrectTagDecl.java', [
+        'import org.chromium.base.Log;',
+        'private static final String TAHG = "cr.Foo";',
+        'some random stuff',
+        'Log.d(TAG, "foo");',
+      ]),
+      MockAffectedFile('HasInlineTag.java', [
+        'import org.chromium.base.Log;',
+        'some random stuff',
+        'private static final String TAG = "cr.Foo";',
+        'Log.d("TAG", "foo");',
+      ]),
+      MockAffectedFile('HasIncorrectTag.java', [
+        'import org.chromium.base.Log;',
+        'some random stuff',
+        'private static final String TAG = "rubbish";',
+        'Log.d(TAG, "foo");',
+      ]),
+      MockAffectedFile('HasTooLongTag.java', [
+        'import org.chromium.base.Log;',
+        'some random stuff',
+        'private static final String TAG = "cr.24_charachers_long___";',
+        'Log.d(TAG, "foo");',
+      ]),
+    ]
+
+    msgs = PRESUBMIT._CheckAndroidCrLogUsage(
+        mock_input_api, mock_output_api)
+
+    self.assertEqual(3, len(msgs))
+
+    # Declaration format
+    self.assertEqual(3, len(msgs[0].items))
+    self.assertTrue('HasNoTagDecl.java' in msgs[0].items)
+    self.assertTrue('HasIncorrectTagDecl.java' in msgs[0].items)
+    self.assertTrue('HasIncorrectTag.java' in msgs[0].items)
+
+    # Tag length
+    self.assertEqual(1, len(msgs[1].items))
+    self.assertTrue('HasTooLongTag.java' in msgs[1].items)
+
+    # Tag must be a variable named TAG
+    self.assertEqual(1, len(msgs[2].items))
+    self.assertTrue('HasInlineTag.java:4' in msgs[2].items)
+
+
 
 if __name__ == '__main__':
   unittest.main()