Allow unit tests to force serial execution in the test launcher.

base/test/launcher/unit_test_launcher.cc

 // Copyright 2013 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 "base/test/launcher/unit_test_launcher.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 539 matching lines @@
   return true;
 }
 
 size_t UnitTestLauncherDelegate::RunTests(
     TestLauncher* test_launcher,
     const std::vector<std::string>& test_names) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   int launch_flags = use_job_objects_ ? TestLauncher::USE_JOB_OBJECTS : 0;
 
+  std::vector<std::string> serialized;
   std::vector<std::string> batch;
-  for (size_t i = 0; i < test_names.size(); i++) {
-    batch.push_back(test_names[i]);
+  for (const auto& test_name : test_names) {
+    if (test_name.find(".SERIALIZE_") != std::string::npos) {
+      serialized.push_back(test_name);
+      continue;
+    }
+    batch.push_back(test_name);
 
     // Use 0 to indicate unlimited batch size.
     if (batch.size() >= batch_limit_ && batch_limit_ != 0) {
       RunUnitTestsBatch(test_launcher, platform_delegate_, batch, launch_flags);
       batch.clear();
     }
   }
 
   RunUnitTestsBatch(test_launcher, platform_delegate_, batch, launch_flags);
 
+  RunUnitTestsSerially(test_launcher, platform_delegate_, serialized,
+                       launch_flags);
+
   return test_names.size();
 }
 
 size_t UnitTestLauncherDelegate::RetryTests(
     TestLauncher* test_launcher,
     const std::vector<std::string>& test_names) {
   MessageLoop::current()->PostTask(
       FROM_HERE,
       Bind(&RunUnitTestsSerially,
            test_launcher,
            platform_delegate_,
            test_names,
            use_job_objects_ ? TestLauncher::USE_JOB_OBJECTS : 0));
   return test_names.size();
 }
 
 }  // namespace base