Adds TaskQueueManager::AnyThread

third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
index 6b4305ea49243ada10b507e7e5e4814f9983a4b9..6be58654fb5b9a87041a2b3c1a89d1b667699b05 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
@@ -246,9 +246,25 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
   // the main thread and other threads.
   std::set<base::TimeTicks> main_thread_pending_wakeups_;
 
-  // Protects |other_thread_pending_wakeup_|.
-  mutable base::Lock other_thread_lock_;
-  bool other_thread_pending_wakeup_;
+  struct AnyThread {
+    AnyThread();
+
+    bool other_thread_pending_wakeup;
+  };
+
+  // TODO(alexclarke): Add a MainThreadOnly struct too.
+
+  mutable base::Lock any_thread_lock_;
+  AnyThread any_thread_;
+
+  struct AnyThread& any_thread() {
+    any_thread_lock_.AssertAcquired();
+    return any_thread_;
+  }
+  const struct AnyThread& any_thread() const {
+    any_thread_lock_.AssertAcquired();
+    return any_thread_;
+  }
 
   bool record_task_delay_histograms_;