Let blink scheduler know when background parsing a document

third_party/WebKit/public/platform/WebViewScheduler.h

 // 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.
 
 #ifndef WebViewScheduler_h
 #define WebViewScheduler_h
 
 #include "WebCommon.h"
 #include "public/platform/BlameContext.h"
 
@@ skipping 35 matching lines @@
         // timer may fire.  NOTE Tasks will be run in time order (as usual).
         ADVANCE,
 
         // In this policy virtual time is not allowed to advance. Delayed tasks posted to
         // WebTaskRunners owned by any child WebFrameSchedulers will be paused, unless their
         // scheduled run time is less than or equal to the current virtual time.  Note non-delayed
         // tasks will run as normal.
         PAUSE,
 
         // In this policy virtual time is allowed to advance unless there are pending network
-        // fetches associated any child WebFrameScheduler.
+        // fetches associated any child WebFrameScheduler, or a document is being parsed on a
+        // background thread.
         PAUSE_IF_NETWORK_FETCHES_PENDING

[Mike West, 2016/07/29 13:49:08]

Nit: Is there a name for this enum that could represent the state you're now
checking?

[alex clarke (OOO till 29th), 2016/07/29 14:07:27]

Done.

     };
 
     // Sets the virtual time policy, which is applied imemdiatly to all child WebFrameSchedulers.
     virtual void setVirtualTimePolicy(VirtualTimePolicy) = 0;
 };
 
 } // namespace blink
 
 #endif // WebViewScheduler