[Android] Implement gtest and local in platform mode.

build/android/pylib/local/device/local_device_test_run.py

+# Copyright 2014 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.
+
+
+from pylib.base import base_test_result
+from pylib.base import test_run
+from pylib.base import test_collection
+
+
+class LocalDeviceTestRun(test_run.TestRun):
+
+  #override
+  def RunTests(self):
+    tests = self._GetTests()
+
+    def run_tests_on_device(dev, tests):
+      r = base_test_result.TestRunResults()
+      for test in tests:
+        result = self._RunTest(dev, test)
+        if isinstance(result, base_test_result.BaseTestResult):
+          r.AddResult(result)
+        elif isinstance(result, list):
+          r.AddResults(result)
+        else:
+          raise Exception('Unexpected result type: %s' % type(result).__name__)
+        if isinstance(tests, test_collection.TestCollection):

[klundberg, 2014/12/09 02:30:47]

Should this really be called for each test in tests? Or after the loop?

[jbudorick, 2014/12/09 15:46:52]

Yep, we have to tell the TestCollection each time we finish a test.

+          tests.test_completed()
+      return r
+
+    tries = 0
+    results = base_test_result.TestRunResults()
+    while tries < self._env.max_tries and tests:
+      if self._ShouldShard():
+        tests = test_collection.TestCollection(self._CreateShards(tests))
+      try_results = self._env.parallel_devices.pMap(
+          run_tests_on_device, tests).pGet(None)
+      fail_results = []
+      for tr in try_results:

[klundberg, 2014/12/09 02:30:47]

I know why you are using tr but I personally prefer longer more meaningful
names. 

[jbudorick, 2014/12/09 15:46:51]

expanded:
 tr -> try_result
 r -> result

+        for r in tr.GetAll():
+          if r.GetType() in (base_test_result.ResultType.PASS,
+                             base_test_result.ResultType.SKIP):
+            results.AddResult(r)
+          else:
+            fail_results.append(r)
+      tests = [f.GetName() for f in fail_results]
+      tries += 1
+
+    if fail_results:
+      results.AddTestResults(fail_results)
+    return results
+
+  def _CreateShards(self, tests):
+    raise NotImplementedError
+
+  def _GetTests(self):
+    raise NotImplementedError
+
+  def _RunTest(self, device, test):
+    raise NotImplementedError
+
+  def _ShouldShard(self):
+    raise NotImplementedError