Add deprecation message for -webkit-background-composite

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 "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class ChromeClient;
 class ConsoleMessageStorage;
+class DeprecationHelper;
 class EventHandlerRegistry;
 class Page;
 class PageScaleConstraintsSet;
 class Settings;
 class UseCounter;
 class Visitor;
 
 // 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 NoBaseWillBeGarbageCollectedFinalized<FrameHost> {
     WTF_MAKE_NONCOPYABLE(FrameHost); USING_FAST_MALLOC_WILL_BE_REMOVED(FrameHost);
 public:
     static PassOwnPtrWillBeRawPtr<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;
+    DeprecationHelper& deprecationHelper() 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;
@@ skipping 27 matching lines @@
     const OwnPtrWillBeMember<EventHandlerRegistry> m_eventHandlerRegistry;
     const OwnPtrWillBeMember<ConsoleMessageStorage> m_consoleMessageStorage;
 
     AtomicString m_overrideEncoding;
     int m_subframeCount;
 };
 
 }
 
 #endif // FrameHost_h