Prepare for per-webview virtual time

components/scheduler/renderer/renderer_scheduler_impl.cc

 // Copyright 2014 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/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 1112 matching lines @@
   AnyThread().user_model.Reset(helper_.scheduler_tqm_delegate()->NowTicks());
   AnyThread().have_seen_touchstart = false;
   MainThreadOnly().loading_task_cost_estimator.Clear();
   MainThreadOnly().timer_task_cost_estimator.Clear();
   MainThreadOnly().idle_time_estimator.Clear();
   MainThreadOnly().have_seen_a_begin_main_frame = false;
   MainThreadOnly().have_reported_blocking_intervention_since_navigation = false;
   UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
 }
 
-double RendererSchedulerImpl::CurrentTimeSeconds() const {
-  return helper_.scheduler_tqm_delegate()->CurrentTimeSeconds();
+double RendererSchedulerImpl::VirtualTimeSeconds() const {
+  TaskQueue* current_tq = helper_.CurrentlyExecutingTaskQueue();
+  base::TimeTicks now = current_tq
+                            ? current_tq->GetTimeDomain()->Now()
+                            : helper_.scheduler_tqm_delegate()->NowTicks();
+  return (now - base::TimeTicks::UnixEpoch()).InSecondsF();
 }
 
-double RendererSchedulerImpl::MonotonicallyIncreasingTimeSeconds() const {
-  return helper_.scheduler_tqm_delegate()->NowTicks().ToInternalValue() /
+double RendererSchedulerImpl::MonotonicallyIncreasingVirtualTimeSeconds()
+    const {
+  TaskQueue* current_tq = helper_.CurrentlyExecutingTaskQueue();
+  base::TimeTicks now = current_tq
+                            ? current_tq->GetTimeDomain()->Now()
+                            : helper_.scheduler_tqm_delegate()->NowTicks();
+  return now.ToInternalValue() /
          static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
 void RendererSchedulerImpl::RegisterTimeDomain(TimeDomain* time_domain) {
   helper_.RegisterTimeDomain(time_domain);
 }
 
 void RendererSchedulerImpl::UnregisterTimeDomain(TimeDomain* time_domain) {
   helper_.UnregisterTimeDomain(time_domain);
 }
@@ skipping 42 matching lines @@
     }
     MainThreadOnly().have_reported_blocking_intervention_since_navigation =
         true;
     BroadcastConsoleWarning(
         "Deferred long-running timer task(s) to improve scrolling smoothness. "
         "See crbug.com/574343.");
   }
 }
 
 }  // namespace scheduler