[SPv2] Paint accelerated canvases as foreign layers.

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
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     bool m_isHidden;
     bool m_isDeferralEnabled;
     bool m_isRegisteredTaskObserver;
     bool m_renderingTaskCompletedForCurrentFrame;
     bool m_softwareRenderingWhileHidden;
     bool m_surfaceCreationFailedAtLeastOnce = false;
     bool m_hibernationScheduled = false;
 
     friend class Canvas2DLayerBridgeTest;
     friend class CanvasRenderingContext2DTest;
+    friend class HTMLCanvasPainterTestForSPv2;
 
     uint32_t m_lastImageId;
 
     enum {
         // We should normally not have more that two active mailboxes at a time,
         // but sometime we may have three due to the async nature of mailbox handling.
         MaxActiveMailboxes = 3,
     };
 
     Deque<MailboxInfo, MaxActiveMailboxes> m_mailboxes;
     GLenum m_lastFilter;
     AccelerationMode m_accelerationMode;
     OpacityMode m_opacityMode;
     const IntSize m_size;
     int m_recordingPixelCount;
 
 #if USE_IOSURFACE_FOR_2D_CANVAS
     // Each element in this vector represents an IOSurface backed texture that
     // is ready to be reused.
     // Elements in this vector can safely be purged in low memory conditions.
     Vector<ImageInfo> m_imageInfoCache;
 #endif // USE_IOSURFACE_FOR_2D_CANVAS
 };
 
 } // namespace blink
 
 #endif