NOT FOR REVIEW: Adding prioritized incoming task queue to renderers

base/message_loop/message_loop.cc

Index: base/message_loop/message_loop.cc
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index dd1a393ab08633514df9d6d021a1be7ff4dbd23f..fc905a44f5f742aa1d60d9bac6a5a34105ed6784 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -519,6 +519,10 @@ void MessageLoop::ReloadWorkQueue() {
     incoming_task_queue_->ReloadWorkQueue(&work_queue_);
 }
 
+TaskQueue& MessageLoop::SelectNextWorkQueue() {
+  return work_queue_;
+}
+
 void MessageLoop::ScheduleWork(bool was_empty) {
   // The Android UI message loop needs to get notified each time
   // a task is added to the incoming queue.
@@ -560,13 +564,16 @@ bool MessageLoop::DoWork() {
 
   for (;;) {
     ReloadWorkQueue();
-    if (work_queue_.empty())
+
+    TaskQueue& current_work_queue = SelectNextWorkQueue();
+
+    if (current_work_queue.empty())
       break;
 
     // Execute oldest task.
     do {
-      PendingTask pending_task = work_queue_.front();
-      work_queue_.pop();
+      PendingTask pending_task = current_work_queue.front();
+      current_work_queue.pop();
       if (!pending_task.delayed_run_time.is_null()) {
         AddToDelayedWorkQueue(pending_task);
         // If we changed the topmost task, then it is time to reschedule.
@@ -576,7 +583,7 @@ bool MessageLoop::DoWork() {
         if (DeferOrRunPendingTask(pending_task))
           return true;
       }
-    } while (!work_queue_.empty());
+    } while (!current_work_queue.empty());
   }
 
   // Nothing happened.