cc: Add asynchronous setPixel interface.

cc/resource_provider.h

 // Copyright 2012 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 CC_RESOURCE_PROVIDER_H_
 #define CC_RESOURCE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 179 matching lines @@
 
     private:
         ResourceProvider* m_resourceProvider;
         ResourceProvider::ResourceId m_resourceId;
         SkBitmap m_skBitmap;
         scoped_ptr<SkCanvas> m_skCanvas;
 
         DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockSoftware);
     };
 
+    // This set of functions can be used to asynchronously set pixel values
+    // for a resource.
+    void acquirePixelBuffer(ResourceId id);
+    void releasePixelBuffer(ResourceId id);
+    uint8_t* mapPixelBuffer(ResourceId id);
+    void unmapPixelBuffer(ResourceId id);
+    void beginSetPixels(ResourceId id);
+    bool didSetPixelsComplete(ResourceId id);
+    void abortSetPixels(ResourceId id);
+
 private:
     struct Resource {
         Resource();
         Resource(unsigned textureId, int pool, const gfx::Size& size, GLenum format);
         Resource(uint8_t* pixels, int pool, const gfx::Size& size, GLenum format);
 
         unsigned glId;
+        // Pixel buffer used for asynchronous set pixels.
+        unsigned glPixelBufferId;
+        // Query used to determine when asynchronous set pixels complete.
+        unsigned glUploadQueryId;
         Mailbox mailbox;
         uint8_t* pixels;
+        uint8_t* pixelBuffer;
         int pool;
         int lockForReadCount;
         bool lockedForWrite;
         bool external;
         bool exported;
         bool markedForDeletion;
         gfx::Size size;
         GLenum format;
         ResourceType type;
     };
@@ skipping 35 matching lines @@
     int m_maxTextureSize;
 
     base::ThreadChecker m_threadChecker;
 
     DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }
 
 #endif  // CC_RESOURCE_PROVIDER_H_