mac: Use IOSurfaces in Canvas2DLayerBridge.

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
@@ skipping 114 matching lines @@
 
     void setLoggerForTesting(PassOwnPtr<Logger>);
 
 private:
     struct MailboxInfo {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
         WebExternalTextureMailbox m_mailbox;
         RefPtr<SkImage> m_image;
         RefPtr<Canvas2DLayerBridge> m_parentLayerBridge;
 
+        // If this mailbox wraps an IOSurface-backed texture, the ids of the
+        // CHROMIUM image and the texture.
+        GLuint m_CHROMIUMImageId = 0;

[Justin Novosad, 2016/03/02 16:33:45]

Can we use "#if OS(MACOSX)" for this (and the code that uses it)?

+        GLuint m_textureId = 0;
+
         MailboxInfo(const MailboxInfo&);
         MailboxInfo() {}
     };
 
     Canvas2DLayerBridge(PassOwnPtr<WebGraphicsContext3DProvider>, const IntSize&, int msaaSampleCount, OpacityMode, AccelerationMode);
     WebGraphicsContext3D* context();
     void startRecording();
     void skipQueuedDrawCommands();
     void flushRecordingOnly();
     void unregisterTaskObserver();
     void reportSurfaceCreationFailure();
 
     // WebThread::TaskOberver implementation
     void willProcessTask() override;
     void didProcessTask() override;
 
     SkSurface* getOrCreateSurface(AccelerationHint = PreferAcceleration);
     bool shouldAccelerate(AccelerationHint) const;
 
     // Returns the GL filter associated with |m_filterQuality|.
     GLenum getGLFilter();
 
+    // Creates an IOSurface-backed texture. Copies |image| into the texture.
+    // Prepares a mailbox from the texture. Stores all information in a newly
+    // created MailboxInfo, which resides in |m_mailboxes|. Returns whether the
+    // mailbox was successfully prepared. |mailbox| is an out parameter only
+    // populated on success.
+    bool prepareIOSurfaceMailboxFromImage(RefPtr<SkImage>&, WebExternalTextureMailbox*);
+
+    // Creates an IOSurface-backed texture. Returns whether the texture ewas
+    // successfully created. |texture| and |imageId| are out parameters. The
+    // caller takes ownership of both the texture and the image.
+    bool createIOSurfaceBackedTexture(GLuint* texture, GLuint* imageId);
+
     // Prepends a new MailboxInfo object to |m_mailboxes|, and returns a
     // reference. The reference is no longer valid after |m_mailboxes| is
     // mutated.
     MailboxInfo& createMailboxInfo();
 
     // Returns whether the mailbox was successfully prepared from the SkImage.
     // The mailbox is an out parameter only populated on success.
     bool prepareMailboxFromImage(RefPtr<SkImage>&, WebExternalTextureMailbox*);
 
     OwnPtr<SkPictureRecorder> m_recorder;
@@ skipping 33 matching lines @@
     GLenum m_lastFilter;
     AccelerationMode m_accelerationMode;
     OpacityMode m_opacityMode;
     IntSize m_size;
     int m_recordingPixelCount;
 };
 
 } // namespace blink
 
 #endif