Add a signal to the scheduler that a navigation is expected

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 122918693a863641b39726789d7690050ba2440a..49cb48df4f9f277b295c03df7d3766288482abbc 100644
--- a/third_party/WebKit/public/platform/WebScheduler.h
+++ b/third_party/WebKit/public/platform/WebScheduler.h
@@ -84,6 +84,13 @@ public:
     // if the suspension count is zero and the current scheduler policy allows it.
     virtual void resumeTimerQueue() { }
 
+    // Tells the scheduler that a navigation is expected. This temporarially

[Sami, 2015/09/24 14:15:04]

nit: I don't think we need to specify here how this will be affect the policy --
will definitely forget to update it :)

[alex clarke (OOO till 29th), 2015/09/24 14:53:10]

Done.

+    // prevents blocking of expensive tasks.    
+    virtual void navigationExpected() { }

[Sami, 2015/09/24 14:15:04]

nit: should all of these be onNavigation[...] to match content/?

[alex clarke (OOO till 29th), 2015/09/24 14:53:10]

Done.

+
+    // Tells the scheduler that an expected navigation was canceled.
+    virtual void navigationCanceled() { }
+
 #ifdef INSIDE_BLINK
     // Helpers for posting bound functions as tasks.
     typedef Function<void(double deadlineSeconds)> IdleTask;