Let blink scheduler know when background parsing a document

components/scheduler/renderer/web_view_scheduler_impl_unittest.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_view_scheduler_impl.h"
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
@@ skipping 532 matching lines @@
   web_view_scheduler_->DidStopLoading(1u);
   EXPECT_TRUE(web_view_scheduler_->virtualTimeAllowedToAdvance());
 
   web_view_scheduler_->DidStartLoading(2u);
   EXPECT_FALSE(web_view_scheduler_->virtualTimeAllowedToAdvance());
 
   web_view_scheduler_->DidStopLoading(2u);
   EXPECT_TRUE(web_view_scheduler_->virtualTimeAllowedToAdvance());
 }
 
+TEST_F(WebViewSchedulerImplTest,
+    BackgroundParser_PAUSE_IF_NETWORK_FETCHES_PENDING) {
+  web_view_scheduler_->setVirtualTimePolicy(
+      VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING);
+  EXPECT_TRUE(web_view_scheduler_->virtualTimeAllowedToAdvance());
+
+  web_view_scheduler_->IncrementBackgroundParserCount();
+  EXPECT_FALSE(web_view_scheduler_->virtualTimeAllowedToAdvance());
+
+  web_view_scheduler_->IncrementBackgroundParserCount();
+  EXPECT_FALSE(web_view_scheduler_->virtualTimeAllowedToAdvance());
+
+  web_view_scheduler_->DecrementBackgroundParserCount();
+  EXPECT_FALSE(web_view_scheduler_->virtualTimeAllowedToAdvance());
+
+  web_view_scheduler_->DecrementBackgroundParserCount();
+  EXPECT_TRUE(web_view_scheduler_->virtualTimeAllowedToAdvance());
+}
+
 }  // namespace scheduler