Make attrib missing buffer message clearer.

Source/core/html/canvas/WebGLRenderingContext.h

 /*
  * Copyright (C) 2009 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 353 matching lines @@
     // Query if the GL implementation is NPOT strict.
     bool isGLES2NPOTStrict() { return m_isGLES2NPOTStrict; }
     // Query if depth_stencil buffer is supported.
     bool isDepthStencilSupported() { return m_isDepthStencilSupported; }
 
     // Helper to return the size in bytes of OpenGL data types
     // like GL_FLOAT, GL_INT, etc.
     unsigned sizeInBytes(GLenum type);
 
     // Check if each enabled vertex attribute is bound to a buffer.
-    bool validateRenderingState();
+    bool validateRenderingState(const char*);
 
     bool validateWebGLObject(const char*, WebGLObject*);
 
     // Adds a compressed texture format.
     void addCompressedTextureFormat(GLenum);
     void removeAllCompressedTextureFormats();
 
     PassRefPtr<Image> drawImageIntoBuffer(Image*, int width, int height);
 
     PassRefPtr<Image> videoFrameToImage(HTMLVideoElement*, BackingStoreCopy);
@@ skipping 539 matching lines @@
     // If the vector is empty, return the maximum allowed active context number.
     static size_t oldestContextIndex();
     static IntSize oldestContextSize();
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContext, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace WebCore
 
 #endif