[scheduler] Add TaskQueue::Observer

third_party/WebKit/Source/platform/scheduler/base/real_time_domain.cc

 // Copyright 2015 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 "platform/scheduler/base/real_time_domain.h"
 
 #include "base/bind.h"
 #include "platform/scheduler/base/task_queue_impl.h"
 #include "platform/scheduler/base/task_queue_manager.h"
 #include "platform/scheduler/base/task_queue_manager_delegate.h"
 
 namespace blink {
 namespace scheduler {
 
 RealTimeDomain::RealTimeDomain(const char* tracing_category)
-    : TimeDomain(nullptr),
-      tracing_category_(tracing_category),
-      task_queue_manager_(nullptr) {}
-
-RealTimeDomain::RealTimeDomain(TimeDomain::Observer* observer,
-                               const char* tracing_category)
-    : TimeDomain(observer),
-      tracing_category_(tracing_category),
-      task_queue_manager_(nullptr) {}
+    : tracing_category_(tracing_category), task_queue_manager_(nullptr) {}
 
 RealTimeDomain::~RealTimeDomain() {}
 
 void RealTimeDomain::OnRegisterWithTaskQueueManager(
     TaskQueueManager* task_queue_manager) {
   task_queue_manager_ = task_queue_manager;
   DCHECK(task_queue_manager_);
 }
 
 LazyNow RealTimeDomain::CreateLazyNow() const {
@@ skipping 36 matching lines @@
 }
 
 void RealTimeDomain::AsValueIntoInternal(
     base::trace_event::TracedValue* state) const {}
 
 const char* RealTimeDomain::GetName() const {
   return "RealTimeDomain";
 }
 }  // namespace scheduler
 }  // namespace blink