Move overscroll logic out of EventHandler.

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

 /*
  * Copyright (C) 2013 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 27 matching lines @@
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class ChromeClient;
 class ConsoleMessageStorage;
 class Deprecation;
 class EventHandlerRegistry;
+class OverscrollController;
 class Page;
 struct PageScaleConstraints;
 class PageScaleConstraintsSet;
 class Settings;
 class TopControls;
 class UseCounter;
 class Visitor;
 class VisualViewport;
 
 // FrameHost is the set of global data shared between multiple frames
 // and is provided by the embedder to each frame when created.
 // FrameHost currently corresponds to the Page object in core/page
 // however the concept of a Page is moving up out of Blink.
 // In an out-of-process iframe world, a single Page may have
 // multiple frames in different process, thus Page becomes a
 // browser-level concept and Blink core/ only knows about its LocalFrame (and FrameHost).
 // Separating Page from the rest of core/ through this indirection
 // allows us to slowly refactor Page without breaking the rest of core.
 class CORE_EXPORT FrameHost final : public GarbageCollectedFinalized<FrameHost> {
     WTF_MAKE_NONCOPYABLE(FrameHost);
 public:
     static FrameHost* create(Page&);
     ~FrameHost();
 
     // Careful: This function will eventually be removed.
-    Page& page() const { return *m_page; }
-    Settings& settings() const;
-    ChromeClient& chromeClient() const;
-    UseCounter& useCounter() const;
-    Deprecation& deprecation() const;
+    Page& page();
+    const Page& page() const;
+
+    Settings& settings();
+    const Settings& settings() const;
+
+    ChromeClient& chromeClient();
+    const ChromeClient& chromeClient() const;
+
+    UseCounter& useCounter();
+    const UseCounter& useCounter() const;
+
+    Deprecation& deprecation();
+    const Deprecation& deprecation() const;
 
     // Corresponds to pixel density of the device where this Page is
     // being displayed. In multi-monitor setups this can vary between pages.
     // This value does not account for Page zoom, use LocalFrame::devicePixelRatio instead.
     float deviceScaleFactor() const;
 
-    TopControls& topControls() const;
-    VisualViewport& visualViewport() const;
-    PageScaleConstraintsSet& pageScaleConstraintsSet() const;
-    EventHandlerRegistry& eventHandlerRegistry() const;
+    TopControls& topControls();
+    const TopControls& topControls() const;
+
+    OverscrollController& overscrollController();
+    const OverscrollController& overscrollController() const;
+
+    VisualViewport& visualViewport();
+    const VisualViewport& visualViewport() const;
+
+    PageScaleConstraintsSet& pageScaleConstraintsSet();
+    const PageScaleConstraintsSet& pageScaleConstraintsSet() const;
+
+    EventHandlerRegistry& eventHandlerRegistry();
+    const EventHandlerRegistry& eventHandlerRegistry() const;
 
     const AtomicString& overrideEncoding() const { return m_overrideEncoding; }
     void setOverrideEncoding(const AtomicString& encoding) { m_overrideEncoding = encoding; }
 
-    ConsoleMessageStorage& consoleMessageStorage() const;
+    ConsoleMessageStorage& consoleMessageStorage();
+    const ConsoleMessageStorage& consoleMessageStorage() const;
 
     DECLARE_TRACE();
 
     // Don't allow more than a certain number of frames in a page.
     // This seems like a reasonable upper bound, and otherwise mutually
     // recursive frameset pages can quickly bring the program to its knees
     // with exponential growth in the number of frames.
     static const int maxNumberOfFrames = 1000;
     void incrementSubframeCount() { ++m_subframeCount; }
     void decrementSubframeCount() { ASSERT(m_subframeCount); --m_subframeCount; }
     int subframeCount() const;
 
     void setDefaultPageScaleLimits(float minScale, float maxScale);
     void setUserAgentPageScaleConstraints(const PageScaleConstraints& newConstraints);
 
 private:
     explicit FrameHost(Page&);
 
-    Member<Page> m_page;
+    const Member<Page> m_page;
     const Member<TopControls> m_topControls;
     const OwnPtr<PageScaleConstraintsSet> m_pageScaleConstraintsSet;
     const Member<VisualViewport> m_visualViewport;
+    const Member<OverscrollController> m_overscrollController;
     const Member<EventHandlerRegistry> m_eventHandlerRegistry;
     const Member<ConsoleMessageStorage> m_consoleMessageStorage;
 
     AtomicString m_overrideEncoding;
     int m_subframeCount;
 };
 
 } // namespace blink
 
 #endif // FrameHost_h