[Reland] Per WebViewScheduler virtual time

components/scheduler/child/web_task_runner_impl.cc

Index: components/scheduler/child/web_task_runner_impl.cc
diff --git a/components/scheduler/child/web_task_runner_impl.cc b/components/scheduler/child/web_task_runner_impl.cc
index 49b5133b9ab033ba545844c97b00628226727521..e03ded0cd3fef01a7bc192d16b2cf655619a2c8b 100644
--- a/components/scheduler/child/web_task_runner_impl.cc
+++ b/components/scheduler/child/web_task_runner_impl.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "components/scheduler/base/task_queue.h"
+#include "components/scheduler/base/time_domain.h"
 #include "third_party/WebKit/public/platform/WebTraceLocation.h"
 
 namespace scheduler {
@@ -40,6 +41,16 @@ void WebTaskRunnerImpl::postDelayedTask(
       base::TimeDelta::FromMillisecondsD(delayMs));
 }
 
+double WebTaskRunnerImpl::virtualTimeSeconds() const {
+  return (task_queue_->GetTimeDomain()->Now() - base::TimeTicks::UnixEpoch())
+      .InSecondsF();
+}
+
+double WebTaskRunnerImpl::monotonicallyIncreasingVirtualTimeSeconds() const {
+  return task_queue_->GetTimeDomain()->Now().ToInternalValue() /
+          static_cast<double>(base::Time::kMicrosecondsPerSecond);
+}
+
 blink::WebTaskRunner* WebTaskRunnerImpl::clone() {
   return new WebTaskRunnerImpl(task_queue_);
 }