Plugin Power Saver: Add comprehensive browser tests.

content/public/test/ppapi_test_utils.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_PUBLIC_TEST_PPAPI_TEST_UTILS_H_
 #define CONTENT_PUBLIC_TEST_PPAPI_TEST_UTILS_H_
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 
 namespace base {
 class CommandLine;
 }
 
 // This file specifies utility functions used in Pepper testing in
 // browser_tests and content_browsertests.
 namespace ppapi {
 
 // Strips prefixes used to annotate tests from a test name.
 std::string StripTestPrefixes(const std::string& test_name);
 
 // Registers the PPAPI test plugin to application/x-ppapi-tests. Returns true
 // on success, and false otherwise.
-bool RegisterTestPlugin(base::CommandLine* command_line);
+bool RegisterTestPlugin(base::CommandLine* command_line) WARN_UNUSED_RESULT;
 
 // Registers the PPAPI test plugin with some some extra parameters. Returns true
 // on success and false otherwise.
 bool RegisterTestPluginWithExtraParameters(
     base::CommandLine* command_line,
-    const base::FilePath::StringType& extra_registration_parameters);
+    const base::FilePath::StringType& extra_registration_parameters)
+    WARN_UNUSED_RESULT;
+
+// Registers the Power Saver test plugin to application/x-ppapi-tests.
+// Returns true on success, and false otherwise.
+bool RegisterPowerSaverTestPlugin(base::CommandLine* command_line)
+    WARN_UNUSED_RESULT;
 
 }  // namespace ppapi
 
 #endif  // CONTENT_PUBLIC_TEST_PPAPI_TEST_UTILS_H_