Prepare for per-webview virtual time

components/scheduler/renderer/auto_advancing_virtual_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 "components/scheduler/renderer/auto_advancing_virtual_time_domain.h"
+
+namespace scheduler {
+
+AutoAdvancingVirtualTimeDomain::AutoAdvancingVirtualTimeDomain(
+    base::TimeTicks initial_time)
+    : VirtualTimeDomain(nullptr, initial_time),
+      can_advance_virtual_time_(true) {}
+
+AutoAdvancingVirtualTimeDomain::~AutoAdvancingVirtualTimeDomain() {}
+
+bool AutoAdvancingVirtualTimeDomain::MaybeAdvanceTime() {
+  base::TimeTicks run_time;
+  if (!can_advance_virtual_time_ || !NextScheduledRunTime(&run_time)) {
+    return false;
+  }
+  AdvanceTo(run_time);
+  return true;
+}
+
+void AutoAdvancingVirtualTimeDomain::RequestWakeup(base::TimeTicks now,
+                                                   base::TimeDelta delay) {
+  base::TimeTicks dummy;
+  if (can_advance_virtual_time_ && !NextScheduledRunTime(&dummy))
+    RequestDoWork();
+}
+
+void AutoAdvancingVirtualTimeDomain::SetCanAdvanceVirtualTime(
+    bool can_advance_virtual_time) {
+  can_advance_virtual_time_ = can_advance_virtual_time;
+  if (can_advance_virtual_time_)
+    RequestDoWork();
+}
+
+const char* AutoAdvancingVirtualTimeDomain::GetName() const {
+  return "AutoAdvancingVirtualTimeDomain";
+}
+
+}  // namespace scheduler