Let blink scheduler know when background parsing a document

components/scheduler/renderer/web_frame_scheduler_impl.cc

 // Copyright 2015 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/web_frame_scheduler_impl.h"
 
 #include "base/trace_event/blame_context.h"
 #include "components/scheduler/base/real_time_domain.h"
 #include "components/scheduler/base/virtual_time_domain.h"
 #include "components/scheduler/child/web_task_runner_impl.h"
@@ skipping 100 matching lines @@
 void WebFrameSchedulerImpl::didStartLoading(unsigned long identifier) {
   if (parent_web_view_scheduler_)
     parent_web_view_scheduler_->DidStartLoading(identifier);
 }
 
 void WebFrameSchedulerImpl::didStopLoading(unsigned long identifier) {
   if (parent_web_view_scheduler_)
     parent_web_view_scheduler_->DidStopLoading(identifier);
 }
 
+void WebFrameSchedulerImpl::setDocumentParsingInBackground(
+    bool background_parser_active) {
+  if (background_parser_active)
+    parent_web_view_scheduler_->IncrementBackgroundParserCount();
+  else
+    parent_web_view_scheduler_->DecrementBackgroundParserCount();
+}
+
 void WebFrameSchedulerImpl::setPageVisible(bool page_visible) {
   DCHECK(parent_web_view_scheduler_);
   if (page_visible_ == page_visible)
     return;
 
   page_visible_ = page_visible;
 
   if (!timer_web_task_runner_ ||
       parent_web_view_scheduler_->virtual_time_domain()) {
     return;
@@ skipping 19 matching lines @@
         parent_web_view_scheduler_->virtual_time_domain());
   }
 
   if (loading_task_queue_) {
     loading_task_queue_->SetTimeDomain(
         parent_web_view_scheduler_->virtual_time_domain());
   }
 }
 
 }  // namespace scheduler