Implement top controls show/hide functionality for main thread scrolling

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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FrameHost_h
 #define FrameHost_h
 
 #include "core/frame/PinchViewport.h"
+#include "core/frame/TopControls.h"
 #include "platform/heap/Handle.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class Chrome;
 class ConsoleMessageStorage;
@@ skipping 25 matching lines @@
     Settings& settings() const;
     Chrome& chrome() const;
     UseCounter& useCounter() const;
     InstrumentingAgents* instrumentingAgents() 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;
     PinchViewport& pinchViewport() const;
     EventHandlerRegistry& eventHandlerRegistry() const;
 
     const AtomicString& overrideEncoding() const { return m_overrideEncoding; }
     void setOverrideEncoding(const AtomicString& encoding) { m_overrideEncoding = encoding; }
 
     ConsoleMessageStorage& consoleMessageStorage() const;
 
     void trace(Visitor*);
 
     // 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;
 
 private:
     explicit FrameHost(Page&);
 
     RawPtrWillBeMember<Page> m_page;
+    const OwnPtrWillBeMember<TopControls> m_topControls;
     const OwnPtrWillBeMember<PinchViewport> m_pinchViewport;
     const OwnPtrWillBeMember<EventHandlerRegistry> m_eventHandlerRegistry;
     const OwnPtrWillBeMember<ConsoleMessageStorage> m_consoleMessageStorage;
 
     AtomicString m_overrideEncoding;
     int m_subframeCount;
 };
 
 }
 
 #endif // FrameHost_h