Turn FrameView's paintBehavior into a real global

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 74b3b93dd13ba02b4c50ac5c5bbb751ad5044cd8..30da9303150fdee2940e47700f2619226258b804 100644
--- a/Source/core/paint/FramePainter.cpp
+++ b/Source/core/paint/FramePainter.cpp
@@ -73,7 +73,7 @@ void FramePainter::paintContents(GraphicsContext* context, const IntRect& rect)
         fillWithRed = false; // Subframe, don't fill with red.
     else if (m_frameView.isTransparent())
         fillWithRed = false; // Transparent, don't fill with red.
-    else if (m_frameView.paintBehavior() & PaintBehaviorSelectionOnly)
+    else if (gGlobalPaintFlags & GlobalPaintSelectionOnly)
         fillWithRed = false; // Selections are transparent, don't fill with red.
     else if (m_frameView.nodeToDraw())
         fillWithRed = false; // Element images are transparent, don't fill with red.
@@ -102,15 +102,9 @@ void FramePainter::paintContents(GraphicsContext* context, const IntRect& rect)
 
     FontCachePurgePreventer fontCachePurgePreventer;
 
-    PaintBehavior oldPaintBehavior = m_frameView.paintBehavior();
-
-    if (FrameView* parentView = m_frameView.parentFrameView()) {
-        if (parentView->paintBehavior() & PaintBehaviorFlattenCompositingLayers)
-            m_frameView.setPaintBehavior(m_frameView.paintBehavior() | PaintBehaviorFlattenCompositingLayers);
-    }
-
+    // TODO(jchaffraix): Why is this here and done globally once per paint phase?
     if (document->printing())
-        m_frameView.setPaintBehavior(m_frameView.paintBehavior() | PaintBehaviorFlattenCompositingLayers);
+        gGlobalPaintFlags |= GlobalPaintFlattenCompositingLayers;
 
     ASSERT(!m_frameView.isPainting());
     m_frameView.setIsPainting(true);
@@ -129,14 +123,13 @@ void FramePainter::paintContents(GraphicsContext* context, const IntRect& rect)
     float deviceScaleFactor = blink::deviceScaleFactor(rootLayer->layoutObject()->frame());
     context->setDeviceScaleFactor(deviceScaleFactor);
 
-    layerPainter.paint(context, LayoutRect(rect), m_frameView.paintBehavior(), layoutObject);
+    layerPainter.paint(context, LayoutRect(rect), PaintBehaviorNormal, layoutObject);
 
     if (rootLayer->containsDirtyOverlayScrollbars())
-        layerPainter.paintOverlayScrollbars(context, LayoutRect(rect), m_frameView.paintBehavior(), layoutObject);
+        layerPainter.paintOverlayScrollbars(context, LayoutRect(rect), PaintBehaviorNormal, layoutObject);
 
     m_frameView.setIsPainting(false);
 
-    m_frameView.setPaintBehavior(oldPaintBehavior);
     m_frameView.setLastPaintTime(currentTime());
 
     // Regions may have changed as a result of the visibility/z-index of element changing.