Implement top controls show/hide functionality for main thread scrolling

Source/core/frame/FrameHost.cpp

 /*
  * 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.
  */
 
 #include "config.h"
 #include "core/frame/FrameHost.h"
 
 #include "core/frame/EventHandlerRegistry.h"
+#include "core/frame/TopControls.h"
 #include "core/inspector/ConsoleMessageStorage.h"
 #include "core/inspector/InspectorController.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
 
 namespace blink {
 
 PassOwnPtrWillBeRawPtr<FrameHost> FrameHost::create(Page& page)
 {
     return adoptPtrWillBeNoop(new FrameHost(page));
 }
 
 FrameHost::FrameHost(Page& page)
     : m_page(&page)
+    , m_topControls(TopControls::create(*this))
     , m_pinchViewport(PinchViewport::create(*this))
     , m_eventHandlerRegistry(adoptPtrWillBeNoop(new EventHandlerRegistry(*this)))
     , m_consoleMessageStorage(ConsoleMessageStorage::create())
     , m_subframeCount(0)
 {
 }
 
 // Explicitly in the .cpp to avoid default constructor in .h
 FrameHost::~FrameHost()
 {
@@ skipping 17 matching lines @@
 InstrumentingAgents* FrameHost::instrumentingAgents() const
 {
     return m_page->inspectorController().instrumentingAgents();
 }
 
 float FrameHost::deviceScaleFactor() const
 {
     return m_page->deviceScaleFactor();
 }
 
+TopControls& FrameHost::topControls() const
+{
+    return *m_topControls;
+}
+
 PinchViewport& FrameHost::pinchViewport() const
 {
     return *m_pinchViewport;
 }
 
 EventHandlerRegistry& FrameHost::eventHandlerRegistry() const
 {
     return *m_eventHandlerRegistry;
 }
 
 ConsoleMessageStorage& FrameHost::consoleMessageStorage() const
 {
     return *m_consoleMessageStorage;
 }
 
 void FrameHost::trace(Visitor* visitor)
 {
     visitor->trace(m_page);
+    visitor->trace(m_topControls);
     visitor->trace(m_pinchViewport);
     visitor->trace(m_eventHandlerRegistry);
     visitor->trace(m_consoleMessageStorage);
 }
 
 #if ENABLE(ASSERT)
 void checkFrameCountConsistency(int expectedFrameCount, Frame* frame)
 {
     ASSERT(expectedFrameCount >= 0);
 
     int actualFrameCount = 0;
     for (; frame; frame = frame->tree().traverseNext())
         ++actualFrameCount;
 
     ASSERT(expectedFrameCount == actualFrameCount);
 }
 #endif
 
 int FrameHost::subframeCount() const
 {
 #if ENABLE(ASSERT)
     checkFrameCountConsistency(m_subframeCount + 1, m_page->mainFrame());
 #endif
     return m_subframeCount;
 }
 
 }