Change TaskQueueImpl to use a Deque with an inline capacity of 8

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.h
index 79ef86d7078ecacfe1a027841a6cd76512bbfc07..5a23d3ea5c476eb968aae223bdc0f733e353fb14 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.h
@@ -320,12 +320,16 @@ class PLATFORM_EXPORT TaskQueueImpl final : public TaskQueue {
       EnqueueOrder sequence_number,
       bool nestable);
 
+  // We reserve an inline capacity of 8 tasks to try and reduce the load on
+  // PartitionAlloc.
+  using TaskDeque = WTF::Deque<Task, 8>;
+
   // Extracts all the tasks from the immediate incoming queue and clears it.
   // Can be called from any thread.
-  WTF::Deque<TaskQueueImpl::Task> TakeImmediateIncomingQueue();
+  TaskDeque TakeImmediateIncomingQueue();
 
   void TraceQueueSize() const;
-  static void QueueAsValueInto(const WTF::Deque<Task>& queue,
+  static void QueueAsValueInto(const TaskDeque& queue,
                                base::TimeTicks now,
                                base::trace_event::TracedValue* state);
   static void QueueAsValueInto(const std::priority_queue<Task>& queue,
@@ -372,12 +376,12 @@ class PLATFORM_EXPORT TaskQueueImpl final : public TaskQueue {
   }
 
   mutable base::Lock immediate_incoming_queue_lock_;
-  WTF::Deque<Task> immediate_incoming_queue_;
-  WTF::Deque<Task>& immediate_incoming_queue() {
+  TaskDeque immediate_incoming_queue_;
+  TaskDeque& immediate_incoming_queue() {
     immediate_incoming_queue_lock_.AssertAcquired();
     return immediate_incoming_queue_;
   }
-  const WTF::Deque<Task>& immediate_incoming_queue() const {
+  const TaskDeque& immediate_incoming_queue() const {
     immediate_incoming_queue_lock_.AssertAcquired();
     return immediate_incoming_queue_;
   }