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

Source/core/paint/FramePainter.cpp

Index: Source/core/paint/FramePainter.cpp
diff --git a/Source/core/paint/FramePainter.cpp b/Source/core/paint/FramePainter.cpp
index a2e721af44a8e90dfba9d3c280d12f801eb3f317..ca59656ee30af8952708f46a9e8e0083d3e2b425 100644
--- a/Source/core/paint/FramePainter.cpp
+++ b/Source/core/paint/FramePainter.cpp
@@ -12,8 +12,10 @@
 #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"
@@ -34,10 +36,9 @@ void FramePainter::paint(GraphicsContext* context, const IntRect& rect)
     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);