[Reland] Per WebViewScheduler virtual time

third_party/WebKit/public/platform/WebViewScheduler.h

Index: third_party/WebKit/public/platform/WebViewScheduler.h
diff --git a/third_party/WebKit/public/platform/WebViewScheduler.h b/third_party/WebKit/public/platform/WebViewScheduler.h
index 0e1630cbbd914909a7405a5e4bb9a7c68848af58..5304f1339d089dd13c04f46acefcc32902042bb2 100644
--- a/third_party/WebKit/public/platform/WebViewScheduler.h
+++ b/third_party/WebKit/public/platform/WebViewScheduler.h
@@ -21,6 +21,25 @@ public:
 
     // Creaters a new WebFrameScheduler, the caller is responsible for deleting it.
     virtual WebPassOwnPtr<WebFrameScheduler> createFrameScheduler() = 0;
+
+    // Instructs this WebViewScheduler to use virtual time. When virtual time is enabled
+    // the system doesn't actually sleep for the delays between tasks before executing
+    // them. E.g: A-E are delayed tasks
+    //
+    // |    A   B C  D           E  (normal)
+    // |-----------------------------> time
+    //
+    // |ABCDE                       (virtual time)
+    // |-----------------------------> time
+    virtual void useVirtualTime() = 0;
+
+    // Controls whether or not virtual time is allowed to advance. If virtual time
+    // is not allowed to advance then tasks posted to the WebTaskRunners owned by
+    // any child WebFrameSchedulers will be paused. If virtual time is allowed to
+    // advance then tasks will be run in time order (as usual) but virtual time will
+    // fast forward so that the system doesn't actually sleep for the delays between
+    // tasks before executing them.
+    virtual void setAllowVirtualTimeToAdvance(bool) = 0;

[Sami, 2016/02/01 11:15:07]

Mention that useVirtualTime() must be called before this function.

[alex clarke (OOO till 29th), 2016/02/01 14:16:54]

But it can be used in any order.

 };
 
 } // namespace blink