Android gtest runner: Only query device for test list when necessary (take 2)

build/android/test_runner.py

Index: build/android/test_runner.py
diff --git a/build/android/test_runner.py b/build/android/test_runner.py
index 435624d9afcd94d0345180df7f80e0349a2af9c9..c98fd318d92ede5e6c29285bd75a13d436a2c0c9 100755
--- a/build/android/test_runner.py
+++ b/build/android/test_runner.py
@@ -257,6 +257,13 @@ def AddGTestOptions(parser):
   group.add_argument('--break-on-failure', '--break_on_failure',
                      dest='break_on_failure', action='store_true',
                      help='Whether to break on failure.')
+  group.add_argument('--extract-test-list-from-filter',
+                     action='store_true',
+                     help='When a test filter is specified, and the list of '
+                          'tests can be determined from it, skip querying the '
+                          'device for the list of all tests. Speeds up local '
+                          'development, but is not safe to use on bots ('
+                          'http://crbug.com/549214')
 
   filter_group = group.add_mutually_exclusive_group()
   filter_group.add_argument('-f', '--gtest_filter', '--gtest-filter',