Adds enableVirtualTime and setVirtualTimePolicy To Emulation domain.

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"
 
 #include <memory>
 
 namespace blink {
 
 class WebFrameScheduler;
 
 class BLINK_PLATFORM_EXPORT WebViewScheduler {
 public:
-    virtual ~WebViewScheduler() { }
+    WebViewScheduler();
+    virtual ~WebViewScheduler();
 
     // The scheduler may throttle tasks associated with background pages.
     virtual void setPageVisible(bool) = 0;
 
     // Creates a new WebFrameScheduler. The caller is responsible for deleting
     // it. All tasks executed by the frame scheduler will be attributed to
     // |BlameContext|.
     virtual std::unique_ptr<WebFrameScheduler> createFrameScheduler(BlameContext*) = 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 enableVirtualTime() = 0;
 
     // Controls whether or not virtual time is allowed to advance. If virtual time
     // is not allowed to advance then delayed 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;
+
+    // Returns true if virtual time is allowed to advance.
+    virtual bool virtualTimeAllowedToAdvance() const = 0;
+
+    void incrementPendingResourceLoadCount();

[Sami, 2016/07/01 14:46:30]

Could you add these on the WebFrameScheduler instead? Internally they could just
call into WebViewSchedulerImpl, but it feels like keeping the frame association
might be useful.

[alex clarke (OOO till 29th), 2016/07/01 15:53:23]

Done.

+    void decrementPendingResourceLoadCount();
+
+    enum class VirtualTimePolicy {
+        ADVANCE,
+        PAUSE,
+        PAUSE_IF_NETWORK_FETCHES_PENDING
+    };
+
+    void setVirtualTimePolicy(VirtualTimePolicy);
+
+private:
+    int m_pendingResourceLoadCount;
+    VirtualTimePolicy m_virtualTimePolicy;
 };
 
 } // namespace blink
 
 #endif // WebViewScheduler