[Android] Fix empty gtest test name parsing.

Last week, a CL landed that contained a gtest with an empty test name,
e.g.

  TEST(FooTest, )

This broke our gtest-list-tests parsing logic because it saw this:

  FooTest.

    testBar

and incorrectly handled the line containing only spaces. This patch
fixes the handling of that case.

Review-Url: https://codereview.chromium.org/2582263003
Cr-Commit-Position: refs/heads/master@{#439507}

build/android/pylib/gtest/gtest_test_instance.py

@@ -99,11 +99,13 @@ def ParseGTestListTests(raw_list):
   for test in raw_list:
     if not test:
       continue
-    if test[0] != ' ':
+    if not test.startswith(' '):
       test_case = test.split()[0]
       if test_case.endswith('.'):
         current = test_case
-    elif not 'YOU HAVE' in test:
+    else:
+      test = test.strip()
+      if test and not 'YOU HAVE' in test:
         test_name = test.split()[0]
         ret += [current + test_name]
   return ret

build/android/pylib/gtest/gtest_test_instance_test.py

@@ -81,6 +81,18 @@ class GtestTestInstanceTests(unittest.TestCase):
     ]
     self.assertEqual(expected, actual)
 
+  def testParseGTestListTests_emptyTestName(self):
+    raw_output = [
+      'TestCase.',
+      '  ',
+      '  nonEmptyTestName',
+    ]
+    actual = gtest_test_instance.ParseGTestListTests(raw_output)
+    expected = [
+      'TestCase.nonEmptyTestName',
+    ]
+    self.assertEqual(expected, actual)
+
   def testParseGTestOutput_pass(self):
     raw_output = [
       '[ RUN      ] FooTest.Bar',