scheduler: Implement WebFrameScheduler and WebPageScheduler

third_party/WebKit/Source/core/frame/FrameHost.h

Index: third_party/WebKit/Source/core/frame/FrameHost.h
diff --git a/third_party/WebKit/Source/core/frame/FrameHost.h b/third_party/WebKit/Source/core/frame/FrameHost.h
index 919134d36a754e244d83d1ae6135329f648d339e..405e8d8706c982fa4467d8ca497cb60dec167549 100644
--- a/third_party/WebKit/Source/core/frame/FrameHost.h
+++ b/third_party/WebKit/Source/core/frame/FrameHost.h
@@ -51,6 +51,7 @@ class PageScaleConstraintsSet;
 class Settings;
 class UseCounter;
 class Visitor;
+class WebFrameHostScheduler;
 
 // FrameHost is the set of global data shared between multiple frames
 // and is provided by the embedder to each frame when created.
@@ -102,6 +103,9 @@ public:
     void setDefaultPageScaleLimits(float minScale, float maxScale);
     void setUserAgentPageScaleConstraints(PageScaleConstraints newConstraints);
 
+    WebFrameHostScheduler* frameHostScheduler() const { return m_frameHostScheduler.get(); }
+
+
 private:
     explicit FrameHost(Page&);
 
@@ -111,6 +115,7 @@ private:
     const OwnPtrWillBeMember<VisualViewport> m_visualViewport;
     const OwnPtrWillBeMember<EventHandlerRegistry> m_eventHandlerRegistry;
     const OwnPtrWillBeMember<ConsoleMessageStorage> m_consoleMessageStorage;
+    const OwnPtrWillBeMember<WebFrameHostScheduler> m_frameHostScheduler;
 
     AtomicString m_overrideEncoding;
     int m_subframeCount;