base: Support setting thread priorities generically.

chrome/browser/content_settings/content_settings_pref_provider_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/content_settings/content_settings_pref_provider.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 61 matching lines @@
 
   bool notification_received() const {
     return notification_received_;
   }
 
  private:
   void OnContentSettingsPatternPairsChanged() {
     // Check whether |provider_| holds its lock. For this, we need a
     // separate thread.
     DeadlockCheckerThread thread(provider_);
-    base::PlatformThreadHandle handle = base::kNullThreadHandle;
+    base::PlatformThreadHandle handle;
     ASSERT_TRUE(base::PlatformThread::Create(0, &thread, &handle));
     base::PlatformThread::Join(handle);
     notification_received_ = true;
   }
 
   PrefProvider* provider_;
   PrefChangeRegistrar pref_change_registrar_;
   bool notification_received_;
   DISALLOW_COPY_AND_ASSIGN(DeadlockCheckerObserver);
 };
@@ skipping 342 matching lines @@
     DictionaryValue* mutable_settings = update.Get();
     mutable_settings->SetWithoutPathExpansion("www.example.com,*",
                                               new base::DictionaryValue());
   }
   EXPECT_TRUE(observer.notification_received());
 
   provider.ShutdownOnUIThread();
 }
 
 }  // namespace content_settings