[scheduler] Add TaskQueue::Observer

third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc

 // Copyright 2016 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/renderer/throttled_time_domain.h"
 
 namespace blink {
 namespace scheduler {
 
-ThrottledTimeDomain::ThrottledTimeDomain(TimeDomain::Observer* observer,
-                                         const char* tracing_category)
-    : RealTimeDomain(observer, tracing_category) {}
+ThrottledTimeDomain::ThrottledTimeDomain(const char* tracing_category)
+    : RealTimeDomain(tracing_category) {}
 
 ThrottledTimeDomain::~ThrottledTimeDomain() {}
 
 const char* ThrottledTimeDomain::GetName() const {
   return "ThrottledTimeDomain";
 }
 
 void ThrottledTimeDomain::RequestWakeupAt(base::TimeTicks now,
                                           base::TimeTicks run_time) {
   // We assume the owner (i.e. TaskQueueThrottler) will manage wakeups on our
@@ skipping 14 matching lines @@
   if (now >= next_run_time)
     return base::TimeDelta();  // Makes DoWork post an immediate continuation.
 
   // We assume the owner (i.e. TaskQueueThrottler) will manage wakeups on our
   // behalf.
   return base::nullopt;
 }
 
 }  // namespace scheduler
 }  // namespace blink