content: implement unittests backend for Ozone GBM

content/common/gpu/client/gl_helper_unittest.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 #include <cmath>
 #include <string>
@@ skipping 1972 matching lines @@
   // Test in baseclass since it is friends with GLHelperScaling
   CheckOptimizationsTest();
 }
 
 }  // namespace content
 
 namespace {
 
 int RunHelper(base::TestSuite* test_suite) {
   content::UnitTestTestSuite runner(test_suite);
-  base::MessageLoopForIO message_loop;
+  // Ozone needs MessageLoopForUI. Otherwise, MessageLoopForIO is enough.
+  base::MessageLoopForUI message_loop;

[dshwang, 2016/01/11 20:17:45]

content_gl_tests creates a ContentTestSuite instance after creating
MessageLoopForUI.

   return runner.Run();
 }
 
 }  // namespace
 
 // These tests needs to run against a proper GL environment, so we
 // need to set it up before we can run the tests.
 int main(int argc, char** argv) {
   base::CommandLine::Init(argc, argv);
   base::TestSuite* suite = new content::ContentTestSuite(argc, argv);
 #if defined(OS_MACOSX)
   base::mac::ScopedNSAutoreleasePool pool;
 #endif
 
   return base::LaunchUnitTestsSerially(
     argc,
     argv,
     base::Bind(&RunHelper, base::Unretained(suite)));
 }