Mark some non-spinvalidation methods deprecated, and update paint/README.md

third_party/WebKit/Source/core/layout/PaintInvalidationState.h

 // 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.
 
 #ifndef PaintInvalidationState_h
 #define PaintInvalidationState_h
 
 #include "core/CoreExport.h"
 #include "core/paint/PaintInvalidator.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/PaintInvalidationReason.h"
 #include "platform/transforms/AffineTransform.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/Noncopyable.h"
 
 namespace blink {
 
 class LayoutBoxModelObject;
 class LayoutObject;
 class LayoutView;
 class PaintLayer;
 
+// This is deprecated by PaintInvalidator when SlimmingPaintInvalidation is
+// enabled.
+//
 // PaintInvalidationState is an optimization used during the paint
 // invalidation phase.
 //
 // This class is extremely close to LayoutState so see the documentation
 // of LayoutState for the class existence and performance benefits.
 //
 // The main difference with LayoutState is that it was customized for the
 // needs of the paint invalidation systems (keeping visual rectangles
 // instead of layout specific information).
 //
@@ skipping 160 matching lines @@
   void MapLocalRectToVisualRectInBacking(const LayoutObject&,
                                          LayoutRect&) const override;
 
  private:
   const PaintInvalidationState& paint_invalidation_state_;
 };
 
 }  // namespace blink
 
 #endif  // PaintInvalidationState_h