Allow expensive task blocking if there is pending iframe navigation

third_party/WebKit/public/platform/WebScheduler.h

Index: third_party/WebKit/public/platform/WebScheduler.h
diff --git a/third_party/WebKit/public/platform/WebScheduler.h b/third_party/WebKit/public/platform/WebScheduler.h
index 4d75f1772a17944f018b5b115a8c4d17acc18d43..85ae4674786a4c1f025f9f0db60f8549ab3ccbc3 100644
--- a/third_party/WebKit/public/platform/WebScheduler.h
+++ b/third_party/WebKit/public/platform/WebScheduler.h
@@ -81,10 +81,10 @@ public:
 
     // Tells the scheduler that a navigation task is pending.
     // TODO(alexclarke): Long term should this be a task trait?
-    virtual void addPendingNavigation() = 0;
+    virtual void addPendingNavigation(bool mainFrameNavigating) = 0;

[Sami, 2016/05/09 16:45:21]

I'm tempted to suggest making this an enum instead for readability. WDYT?

[alex clarke (OOO till 29th), 2016/05/09 17:08:09]

Yeah I was tempted to do that too, but didn't initially.  It's done now.

 
     // Tells the scheduler that a navigation task is no longer pending.
-    virtual void removePendingNavigation() = 0;
+    virtual void removePendingNavigation(bool mainFrameNavigating) = 0;
 
     // Tells the scheduler that an expected navigation was started.
     virtual void onNavigationStarted() = 0;