Consider ClipPathDisplayItems for GPU veto.

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.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 DisplayItem_h
 #define DisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/ContiguousContainer.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
 
 #ifndef NDEBUG
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/WTFString.h"
 #endif
 
+class SkPictureGpuAnalyzer;
 
 namespace blink {
 
 class GraphicsContext;
 class IntRect;
 class WebDisplayItemList;
 
 class PLATFORM_EXPORT DisplayItem {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
@@ skipping 312 matching lines @@
 #endif
 
     // True if the client is non-null. Because m_client is const, this should
     // never be false except when we explicitly create a tombstone/"dead display
     // item" as part of moving an item from one list to another (see:
     // DisplayItemList::appendByMoving).
     bool hasValidClient() const { return m_client; }
 
     virtual bool drawsContent() const { return false; }
 
+    // Override to implement specific analysis strategies.
+    virtual void analyzeForGpuRasterization(SkPictureGpuAnalyzer&) const { }
+
 #ifndef NDEBUG
     static WTF::String typeAsDebugString(DisplayItem::Type);
     const WTF::String clientDebugString() const { return m_clientDebugString; }
     void setClientDebugString(const WTF::String& s) { m_clientDebugString = s; }
     WTF::String asDebugString() const;
     virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const;
 #endif
 
 private:
     // The default DisplayItem constructor is only used by
@@ skipping 37 matching lines @@
     bool isEndAndPairedWith(DisplayItem::Type otherType) const override = 0;
 #endif
 
 private:
     bool isEnd() const final { return true; }
 };
 
 } // namespace blink
 
 #endif // DisplayItem_h