DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/core/inspector/InspectorPageAgent.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "core/inspector/InspectorBaseAgent.h"
 #include "core/inspector/InspectorResourceContentLoader.h"
 #include "wtf/HashMap.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Resource;
 class Document;
 class DocumentLoader;
-class LocalFrame;
+class FrameHost;
 class GraphicsContext;
 class GraphicsLayer;
 class InjectedScriptManager;
 class InspectorClient;
 class InspectorOverlay;
 class InspectorResourceContentLoader;
 class KURL;
 class LayoutRect;
+class LocalFrame;
 class Page;
 class RenderObject;
 class SharedBuffer;
 class StyleResolver;
 class TextResourceDecoder;
 
 typedef String ErrorString;
 
 class InspectorPageAgent final : public InspectorBaseAgent<InspectorPageAgent>, public InspectorBackendDispatcher::PageCommandHandler {
     WTF_MAKE_NONCOPYABLE(InspectorPageAgent);
@@ skipping 85 matching lines @@
     void didRecalculateStyle(int);
     void scriptsEnabled(bool isEnabled);
 
     // Inspector Controller API
     void setFrontend(InspectorFrontend*) override;
     void clearFrontend() override;
     void restore() override;
     void discardAgent() override;
 
     // Cross-agents API
-    Page* page() { return m_page; }
-    LocalFrame* mainFrame();
+    FrameHost* frameHost();
+    LocalFrame* inspectedFrame();
     String createIdentifier();
     LocalFrame* frameForId(const String& frameId);
     String frameId(LocalFrame*);
     bool hasIdForFrame(LocalFrame*) const;
     String loaderId(DocumentLoader*);
     LocalFrame* findFrameWithSecurityOrigin(const String& originRawString);
     LocalFrame* assertFrame(ErrorString*, const String& frameId);
     String scriptPreprocessorSource() { return m_scriptPreprocessorSource; }
     const AtomicString& resourceSourceMapURL(const String& url);
     bool deviceMetricsOverrideEnabled();
@@ skipping 55 matching lines @@
 
     OwnPtrWillBeMember<InspectorResourceContentLoader> m_inspectorResourceContentLoader;
     HashMap<String, String> m_editedResourceContent;
 };
 
 
 } // namespace blink
 
 
 #endif // !defined(InspectorPagerAgent_h)