Split InspectorBackend into three parts: backend, injected script host and frontend host.

WebCore/inspector/InspectorController.h

Index: WebCore/inspector/InspectorController.h
diff --git a/WebCore/inspector/InspectorController.h b/WebCore/inspector/InspectorController.h
index d3ea5719a2f8bf011cd2cc631d637585dd5a8883..6f261ec609773a798f53389d46a68caf01283b5c 100644
--- a/WebCore/inspector/InspectorController.h
+++ b/WebCore/inspector/InspectorController.h
@@ -62,10 +62,12 @@ class Document;
 class DocumentLoader;
 class GraphicsContext;
 class HitTestResult;
+class InjectedScriptHost;
 class InspectorBackend;
 class InspectorClient;
 class InspectorDOMAgent;
 class InspectorFrontend;
+class InspectorFrontendHost;
 class InspectorTimelineAgent;
 class JavaScriptCallFrame;
 class KURL;
@@ -166,6 +168,8 @@ public:
     ~InspectorController();
 
     InspectorBackend* inspectorBackend() { return m_inspectorBackend.get(); }
+    InspectorFrontendHost* inspectorFrontendHost() { return m_inspectorFrontendHost.get(); }
+    InjectedScriptHost* injectedScriptHost() { return m_injectedScriptHost.get(); }
 
     void inspectedPageDestroyed();
     void pageDestroyed() { m_page = 0; }
@@ -294,6 +298,8 @@ public:
 
 private:
     friend class InspectorBackend;
+    friend class InspectorFrontendHost;
+    friend class InjectedScriptHost;
     // Following are used from InspectorBackend and internally.
     void scriptObjectReady();
     void moveWindowBy(float x, float y) const;
@@ -387,6 +393,8 @@ private:
     bool m_resourceTrackingEnabled;
     bool m_resourceTrackingSettingsLoaded;
     RefPtr<InspectorBackend> m_inspectorBackend;
+    RefPtr<InspectorFrontendHost> m_inspectorFrontendHost;
+    RefPtr<InjectedScriptHost> m_injectedScriptHost;
     HashMap<String, ScriptValue> m_idToWrappedObject;
     ObjectGroupsMap m_objectGroups;