Implement a paint offset cache for slimming paint v2

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/editing/markers/DocumentMarkerController.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
@@ skipping 62 matching lines @@
         fillWithRed = false; // Subframe, don't fill with red.
     else if (frameView().isTransparent())
         fillWithRed = false; // Transparent, don't fill with red.
     else if (globalPaintFlags & GlobalPaintSelectionOnly)
         fillWithRed = false; // Selections are transparent, don't fill with red.
     else if (frameView().nodeToDraw())
         fillWithRed = false; // Element images are transparent, don't fill with red.
     else
         fillWithRed = true;
 
-    if (fillWithRed && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*context, *frameView().layoutView(), DisplayItem::DebugRedFill)) {
+    if (fillWithRed && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*context, *frameView().layoutView(), DisplayItem::DebugRedFill, LayoutPoint())) {
         IntRect contentRect(IntPoint(), frameView().contentsSize());
-        LayoutObjectDrawingRecorder drawingRecorder(*context, *frameView().layoutView(), DisplayItem::DebugRedFill, contentRect);
+        LayoutObjectDrawingRecorder drawingRecorder(*context, *frameView().layoutView(), DisplayItem::DebugRedFill, contentRect, LayoutPoint());
     }
 #endif
 
     LayoutView* layoutView = frameView().layoutView();
     if (!layoutView) {
         WTF_LOG_ERROR("called FramePainter::paint with nil layoutObject");
         return;
     }
 
     RELEASE_ASSERT(!frameView().needsLayout());
@@ skipping 62 matching lines @@
     if (frameView().layerForScrollCorner())
         return;
 
     paintScrollCorner(context, frameView().scrollCornerRect());
 }
 
 void FramePainter::paintScrollCorner(GraphicsContext* context, const IntRect& cornerRect)
 {
     if (frameView().scrollCorner()) {
         bool needsBackground = frameView().frame().isMainFrame();
-        if (needsBackground && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*context, *frameView().layoutView(), DisplayItem::ScrollbarCorner)) {
-            LayoutObjectDrawingRecorder drawingRecorder(*context, *frameView().layoutView(), DisplayItem::ScrollbarCorner, FloatRect(cornerRect));
+        if (needsBackground && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*context, *frameView().layoutView(), DisplayItem::ScrollbarCorner, LayoutPoint())) {
+            LayoutObjectDrawingRecorder drawingRecorder(*context, *frameView().layoutView(), DisplayItem::ScrollbarCorner, FloatRect(cornerRect), LayoutPoint());
             context->fillRect(cornerRect, frameView().baseBackgroundColor());
 
         }
         ScrollbarPainter::paintIntoRect(frameView().scrollCorner(), context, cornerRect.location(), LayoutRect(cornerRect));
         return;
     }
 
     ScrollbarTheme::theme()->paintScrollCorner(context, *frameView().layoutView(), cornerRect);
 }
 
 void FramePainter::paintScrollbar(GraphicsContext* context, Scrollbar* bar, const IntRect& rect)
 {
     bool needsBackground = bar->isCustomScrollbar() && frameView().frame().isMainFrame();
     if (needsBackground) {
         IntRect toFill = bar->frameRect();
         toFill.intersect(rect);
         context->fillRect(toFill, frameView().baseBackgroundColor());
     }
 
     bar->paint(context, rect);
 }
 
 FrameView& FramePainter::frameView()
 {
     return *m_frameView;
 }
 
 } // namespace blink