[WIP] Adding support for <iframe>s to slimming paint.

Source/core/paint/FramePainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/FramePainter.h"
 
 #include "core/dom/DocumentMarkerController.h"
 #include "core/frame/FrameView.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
+#include "core/paint/ClipRecorder.h"
 #include "core/paint/LayerPainter.h"
 #include "core/paint/ScrollbarPainter.h"
+#include "core/paint/TranslationRecorder.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/scroll/ScrollbarTheme.h"
 
 namespace blink {
 
 bool FramePainter::s_inPaintContents = false;
 
 void FramePainter::paint(GraphicsContext* context, const IntRect& rect)
 {
     m_frameView.notifyPageThatContentAreaWillPaint();
 
     IntRect documentDirtyRect = rect;
     IntRect visibleAreaWithoutScrollbars(m_frameView.location(), m_frameView.visibleContentRect().size());
     documentDirtyRect.intersect(visibleAreaWithoutScrollbars);
 
     if (!documentDirtyRect.isEmpty()) {
-        GraphicsContextStateSaver stateSaver(*context);
-
-        context->translate(m_frameView.x() - m_frameView.scrollX(), m_frameView.y() - m_frameView.scrollY());
-        context->clip(m_frameView.visibleContentRect());
+        // FIXME: Need proper identifier (renderer and phase pair) for the recorders.
+        TranslationRecorder translationRecorder(m_frameView.renderView(), context, FloatSize(m_frameView.x() - m_frameView.scrollX(), m_frameView.y() - m_frameView.scrollY()));
+        ClipRecorder clipRecorder(m_frameView.renderView()->layer(), context, DisplayItem::ClipLayerForeground, LayoutRect(m_frameView.visibleContentRect()));
 
         documentDirtyRect.moveBy(-m_frameView.location() + m_frameView.scrollPosition());
         paintContents(context, documentDirtyRect);
     }
 
     calculateAndPaintOverhangAreas(context, rect);
 
     // Now paint the scrollbars.
     if (!m_frameView.scrollbarsSuppressed() && (m_frameView.horizontalScrollbar() || m_frameView.verticalScrollbar())) {
         GraphicsContextStateSaver stateSaver(*context);
@@ skipping 165 matching lines @@
 {
     IntRect horizontalOverhangRect;
     IntRect verticalOverhangRect;
     m_frameView.calculateOverhangAreasForPainting(horizontalOverhangRect, verticalOverhangRect);
 
     if (dirtyRect.intersects(horizontalOverhangRect) || dirtyRect.intersects(verticalOverhangRect))
         paintOverhangAreas(context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
 }
 
 } // namespace blink