Get rid of slow repaint objects and main thread scrolling reasons.

sky/engine/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 57 matching lines @@
 namespace blink {
 
 double FrameView::s_currentFrameTimeStamp = 0.0;
 bool FrameView::s_inPaintContents = false;
 
 static const double resourcePriorityUpdateDelayAfterScroll = 0.250;
 
 FrameView::FrameView(LocalFrame* frame)
     : m_frame(frame)
     , m_canHaveScrollbars(true)
-    , m_slowRepaintObjectCount(0)
     , m_hasPendingLayout(false)
     , m_layoutSubtreeRoot(0)
     , m_inSynchronousPostLayout(false)
     , m_postLayoutTasksTimer(this, &FrameView::postLayoutTimerFired)
     , m_isTransparent(false)
     , m_baseBackgroundColor(Color::white)
     , m_mediaType("screen")
     , m_overflowStatusDirty(true)
     , m_viewportRenderer(0)
     , m_wasScrolledByUser(false)
@@ skipping 595 matching lines @@
     RenderView* renderView = this->renderView();
     if (renderView && renderView->compositingState() == PaintsIntoOwnBacking) {
         GraphicsLayer* layer = renderView->layer()->compositedLayerMapping()->mainGraphicsLayer();
         if (layer && layer->drawsContent())
             return true;
     }
 
     return false;
 }
 
-void FrameView::addSlowRepaintObject()
-{
-    if (!m_slowRepaintObjectCount++) {
-        if (Page* page = m_frame->page()) {
-            if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
-                scrollingCoordinator->frameViewHasSlowRepaintObjectsDidChange(this);
-        }
-    }
-}
-
-void FrameView::removeSlowRepaintObject()
-{
-    ASSERT(m_slowRepaintObjectCount > 0);
-    m_slowRepaintObjectCount--;
-    if (!m_slowRepaintObjectCount) {
-        if (Page* page = m_frame->page()) {
-            if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
-                scrollingCoordinator->frameViewHasSlowRepaintObjectsDidChange(this);
-        }
-    }
-}
-
 IntPoint FrameView::lastKnownMousePosition() const
 {
     return m_frame->eventHandler().lastKnownMousePosition();
 }
 
 bool FrameView::shouldSetCursor() const
 {
     Page* page = frame().page();
     return page && page->visibilityState() != PageVisibilityStateHidden && page->focusController().isActive() && page->settings().deviceSupportsMouse();
 }
@@ skipping 832 matching lines @@
 void FrameView::setLayoutSizeInternal(const IntSize& size)
 {
     if (m_layoutSize == size)
         return;
 
     m_layoutSize = size;
     contentsResized();
 }
 
 } // namespace blink