Run task queue manager work in batches

content/renderer/scheduler/task_queue_manager.h

Index: content/renderer/scheduler/task_queue_manager.h
diff --git a/content/renderer/scheduler/task_queue_manager.h b/content/renderer/scheduler/task_queue_manager.h
index 100c6d570ca173b44587af4712cbeadcac30d860..f6aca7894a0d7410cfbb5c30e5fef8c55a21246e 100644
--- a/content/renderer/scheduler/task_queue_manager.h
+++ b/content/renderer/scheduler/task_queue_manager.h
@@ -80,6 +80,12 @@ class CONTENT_EXPORT TaskQueueManager {
   // to a static string.
   void SetQueueName(size_t queue_index, const char* name);
 
+  // Set the number of tasks executed in a single invocation of the task queue
+  // manager. Increasing the batch size can reduce the overhead of yielding
+  // back to the main message loop -- at the cost of potentially delaying other
+  // tasks posted to the main loop. The batch size is 1 by default.
+  void SetWorkBatchSize(int work_batch_size);
+
  private:
   friend class internal::TaskQueue;
 
@@ -135,6 +141,8 @@ class CONTENT_EXPORT TaskQueueManager {
   // where re-entrant problems happen.
   int pending_dowork_count_;
 
+  int work_batch_size_;
+
   base::WeakPtrFactory<TaskQueueManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueueManager);