Adds enableVirtualTime and setVirtualTimePolicy To Emulation domain.

components/scheduler/renderer/web_view_scheduler_impl.cc

Index: components/scheduler/renderer/web_view_scheduler_impl.cc
diff --git a/components/scheduler/renderer/web_view_scheduler_impl.cc b/components/scheduler/renderer/web_view_scheduler_impl.cc
index 4ab4c11c570b329381533f53069073ab19c9eb29..48f565c02f6d4df15209c2cf8034ecd53850a7e3 100644
--- a/components/scheduler/renderer/web_view_scheduler_impl.cc
+++ b/components/scheduler/renderer/web_view_scheduler_impl.cc
@@ -24,6 +24,8 @@ WebViewSchedulerImpl::WebViewSchedulerImpl(
     : virtual_time_pump_policy_(TaskQueue::PumpPolicy::AUTO),
       web_view_(web_view),
       renderer_scheduler_(renderer_scheduler),
+      pending_resource_load_count_(0),
+      virtual_time_policy_(VirtualTimePolicy::ADVANCE),
       page_visible_(true),
       disable_background_timer_throttling_(disable_background_timer_throttling),
       allow_virtual_time_to_advance_(true) {
@@ -112,4 +114,51 @@ void WebViewSchedulerImpl::setAllowVirtualTimeToAdvance(
   }
 }
 
+bool WebViewSchedulerImpl::virtualTimeAllowedToAdvance() const {
+  return allow_virtual_time_to_advance_;
+}
+
+void WebViewSchedulerImpl::incrementPendingResourceLoadCount() {
+  pending_resource_load_count_++;
+
+  if (virtual_time_policy_ !=
+      VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING) {
+    return;
+  }
+
+  if (pending_resource_load_count_ == 1)
+    setAllowVirtualTimeToAdvance(false);
+}
+
+void WebViewSchedulerImpl::decrementPendingResourceLoadCount() {
+  pending_resource_load_count_--;
+  DCHECK_GE(pending_resource_load_count_, 0);
+
+  if (virtual_time_policy_ !=
+      VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING) {
+      return;
+  }
+
+  if (pending_resource_load_count_ == 0)
+      setAllowVirtualTimeToAdvance(true);
+}
+
+void WebViewSchedulerImpl::setVirtualTimePolicy(VirtualTimePolicy policy) {
+  virtual_time_policy_ = policy;
+
+  switch (virtual_time_policy_) {
+    case VirtualTimePolicy::ADVANCE:
+      setAllowVirtualTimeToAdvance(true);
+      break;
+
+    case VirtualTimePolicy::PAUSE:
+      setAllowVirtualTimeToAdvance(false);
+      break;
+
+    case VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING:
+      setAllowVirtualTimeToAdvance(pending_resource_load_count_ == 0);
+      break;
+  }
+}
+
 }  // namespace scheduler