Implement WEBGL_shared_resources

Source/core/html/canvas/WebGLFramebuffer.h

Index: Source/core/html/canvas/WebGLFramebuffer.h
diff --git a/Source/core/html/canvas/WebGLFramebuffer.h b/Source/core/html/canvas/WebGLFramebuffer.h
index 438c65e87ca62d40fd8afde04740f8c9b5f6bec3..bd2a2ff18e7478b3dea022c9fdb1861ce799bbb8 100644
--- a/Source/core/html/canvas/WebGLFramebuffer.h
+++ b/Source/core/html/canvas/WebGLFramebuffer.h
@@ -81,13 +81,13 @@ public:
     // Return false if the framebuffer is incomplete; otherwise initialize
     // the buffers if they haven't been initialized and
     // needToInitializeAttachments is true.
-    bool onAccess(GraphicsContext3D*, const char** reason);
+    bool onAccess(WebGLRenderingContext*, WebGLSharedObject::AcquireMode, const char**);
 
     // Software version of glCheckFramebufferStatus(), except that when
     // FRAMEBUFFER_COMPLETE is returned, it is still possible for
     // glCheckFramebufferStatus() to return FRAMEBUFFER_UNSUPPORTED,
     // depending on hardware implementation.
-    GC3Denum checkStatus(const char** reason) const;
+    GC3Denum checkStatus(WebGLRenderingContext*, WebGLSharedObject::AcquireMode, const char**) const;
 
     bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }