[Reland] Per WebViewScheduler virtual time

components/scheduler/renderer/web_view_scheduler_impl.h

Index: components/scheduler/renderer/web_view_scheduler_impl.h
diff --git a/components/scheduler/renderer/web_view_scheduler_impl.h b/components/scheduler/renderer/web_view_scheduler_impl.h
index caed57ed8c5a8eb16ef2a3313e776248531f3bca..65aaeacf36940c3c4149f4a87646217afa5afdf5 100644
--- a/components/scheduler/renderer/web_view_scheduler_impl.h
+++ b/components/scheduler/renderer/web_view_scheduler_impl.h
@@ -23,6 +23,7 @@ class WebView;
 
 namespace scheduler {
 
+class AutoAdvancingVirtualTimeDomain;
 class RendererSchedulerImpl;
 class WebFrameSchedulerImpl;
 
@@ -38,6 +39,9 @@ class SCHEDULER_EXPORT WebViewSchedulerImpl : public blink::WebViewScheduler {
   void setPageVisible(bool page_visible) override;
   blink::WebPassOwnPtr<blink::WebFrameScheduler> createFrameScheduler()
       override;
+  void useVirtualTime() override;

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

Now that this is WebView-specific, I guess it gives another reason for us to get
rid of the default task queues. Any idea how many systems are still using those?

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

Quite a few :(  One problem is the order in which classes are constructed in
blink.  The frame is quite late IIRC.

+  void setAllowVirtualTimeToAdvance(
+      bool allow_virtual_time_to_advance) override;
 
   // Virtual for testing.
   virtual void AddConsoleWarning(const std::string& message);
@@ -50,10 +54,12 @@ class SCHEDULER_EXPORT WebViewSchedulerImpl : public blink::WebViewScheduler {
   void Unregister(WebFrameSchedulerImpl* frame_scheduler);
 
   std::set<WebFrameSchedulerImpl*> frame_schedulers_;
+  scoped_ptr<AutoAdvancingVirtualTimeDomain> virtual_time_domain_;
   blink::WebView* web_view_;
   RendererSchedulerImpl* renderer_scheduler_;
   bool page_visible_;
   bool disable_background_timer_throttling_;
+  bool allow_virtual_time_to_advance_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewSchedulerImpl);
 };