Implement clip and scroll DisplayItems for PartPainter

Source/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 66 matching lines @@
 #include "platform/HostWindow.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/TraceEvent.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/GraphicsLayerDebugInfo.h"
+#include "platform/graphics/paint/DisplayItemList.h"
 #include "platform/scroll/ScrollAnimator.h"
 #include "platform/text/TextStream.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
@@ skipping 1283 matching lines @@
 
 void FrameView::scrollContentsSlowPath(const IntRect& updateRect)
 {
     if (contentsInCompositedLayer()) {
         IntRect updateRect = visibleContentRect();
         ASSERT(renderView());
         renderView()->invalidatePaintRectangle(updateRect);
     }
     if (RenderPart* frameRenderer = m_frame->ownerRenderer()) {
         if (isEnclosedInCompositingLayer()) {
+            if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
+                RenderView* renderView = this->renderView();
+                ASSERT(renderView);
+                renderView->layer()->enclosingLayerForPaintInvalidationCrossingFrameBoundaries()->graphicsLayerBacking()->displayItemList()->invalidate(renderView->displayItemClient());
+            }

[trchen, 2015/01/22 23:47:57]

FIXME: Currently we always use the cached DisplayItem even if we have a new one.
This will change once https://codereview.chromium.org/847783003/ lands and we
won't need this block anymore.

             LayoutRect rect(frameRenderer->borderLeft() + frameRenderer->paddingLeft(),
                             frameRenderer->borderTop() + frameRenderer->paddingTop(),
                             visibleWidth(), visibleHeight());
             frameRenderer->invalidatePaintRectangle(rect);
             return;
         }
     }
 
     hostWindow()->invalidateRect(updateRect);
 }
@@ skipping 2608 matching lines @@
         return;
 
     ScrollableArea::setScrollOrigin(origin);
 
     // Update if the scroll origin changes, since our position will be different if the content size did not change.
     if (updatePositionAtAll && updatePositionSynchronously)
         updateScrollbars(scrollOffsetDouble());
 }
 
 } // namespace blink