Adds enableVirtualTime and setVirtualTimePolicy To Emulation domain.

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 3635b784a04c751614fee6653e7850d56ea7553a..60d9f2ed2c142b9c6d7836b76c8b870461bcd963 100644
--- a/third_party/WebKit/public/platform/WebViewScheduler.h
+++ b/third_party/WebKit/public/platform/WebViewScheduler.h
@@ -8,6 +8,15 @@
 #include "WebCommon.h"
 #include "public/platform/BlameContext.h"
 
+#if INSIDE_BLINK
+#include "wtf/Forward.h"
+#include "wtf/WeakPtr.h"
+#else
+namespace WTF {
+template<typename T> class WeakPtrFactory;
+}
+#endif
+
 #include <memory>
 
 namespace blink {
@@ -16,7 +25,8 @@ 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;
@@ -44,6 +54,33 @@ public:
     // 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();
+    void decrementPendingResourceLoadCount();
+
+    enum class VirtualTimePolicy {
+        ADVANCE,
+        PAUSE,
+        PAUSE_IF_NETWORK_FETCHES_PENDING
+    };
+
+    void setVirtualTimePolicy(VirtualTimePolicy);
+
+#ifdef INSIDE_BLINK
+    void setVirtualTimePolicy(const WTF::String&);
+
+    WeakPtr<WebViewScheduler> createWeakPtr() { return m_weakPtrFactory->createWeakPtr(); }
+#endif
+
+private:
+    int m_pendingResourceLoadCount;
+    VirtualTimePolicy m_virtualTimePolicy;
+
+    // This is ugly. We can't use WTF types outside of blink but we can forward declare them.
+    std::unique_ptr<WTF::WeakPtrFactory<WebViewScheduler>> m_weakPtrFactory;
 };
 
 } // namespace blink