Revert of Remove PaintInfo's paintingRoot

third_party/WebKit/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 "core/paint/FramePainter.h"
 
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/inspector/InspectorInstrumentation.h"
@@ skipping 56 matching lines @@
 #ifndef NDEBUG
     bool fillWithRed;
     if (document->printing())
         fillWithRed = false; // Printing, don't fill with red (can't remember why).
     else if (frameView().frame().owner())
         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, LayoutPoint())) {
         IntRect contentRect(IntPoint(), frameView().contentsSize());
         LayoutObjectDrawingRecorder drawingRecorder(context, *frameView().layoutView(), DisplayItem::DebugRedFill, contentRect, LayoutPoint());
     }
 #endif
 
     LayoutView* layoutView = frameView().layoutView();
@@ skipping 14 matching lines @@
 
     // TODO(jchaffraix): GlobalPaintFlags should be const during a paint
     // phase. Thus we should set this flag upfront (crbug.com/510280).
     GlobalPaintFlags localPaintFlags = globalPaintFlags;
     if (document->printing())
         localPaintFlags |= GlobalPaintFlattenCompositingLayers | GlobalPaintPrinting;
 
     ASSERT(!frameView().isPainting());
     frameView().setIsPainting(true);
 
+    // frameView().nodeToDraw() is used to draw only one element (and its descendants)
+    LayoutObject* layoutObject = frameView().nodeToDraw() ? frameView().nodeToDraw()->layoutObject() : 0;
     PaintLayer* rootLayer = layoutView->layer();
 
 #if ENABLE(ASSERT)
     layoutView->assertSubtreeIsLaidOut();
     LayoutObject::SetLayoutNeededForbiddenScope forbidSetNeedsLayout(*rootLayer->layoutObject());
 #endif
 
     PaintLayerPainter layerPainter(*rootLayer);
 
     float deviceScaleFactor = blink::deviceScaleFactor(rootLayer->layoutObject()->frame());
     context.setDeviceScaleFactor(deviceScaleFactor);
 
-    layerPainter.paint(context, LayoutRect(rect), localPaintFlags);
+    layerPainter.paint(context, LayoutRect(rect), localPaintFlags, layoutObject);
 
     if (rootLayer->containsDirtyOverlayScrollbars())
-        layerPainter.paintOverlayScrollbars(context, LayoutRect(rect), localPaintFlags);
+        layerPainter.paintOverlayScrollbars(context, LayoutRect(rect), localPaintFlags, layoutObject);
 
     frameView().setIsPainting(false);
 
     // Regions may have changed as a result of the visibility/z-index of element changing.
     if (document->annotatedRegionsDirty())
         frameView().updateDocumentAnnotatedRegions();
 
     if (isTopLevelPainter) {
         // Everything that happens after paintContents completions is considered
         // to be part of the next frame.
@@ skipping 45 matching lines @@
     bar.paint(context, CullRect(rect));
 }
 
 const FrameView& FramePainter::frameView()
 {
     ASSERT(m_frameView);
     return *m_frameView;
 }
 
 } // namespace blink