update getFramebufferAttachmentParameter for WebGL 2

Source/core/html/canvas/WebGLRenderingContextBase.cpp

 /*
  * 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 2269 matching lines @@
         case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
             return WebGLAny(scriptState, PassRefPtrWillBeRawPtr<WebGLObject>(object));
         case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
         case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
             {
                 GLint value = 0;
                 webContext()->getFramebufferAttachmentParameteriv(target, attachment, pname, &value);
                 return WebGLAny(scriptState, value);
             }
         case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT:
-            if (extensionEnabled(EXTsRGBName) || isWebGL2OrHigher()) {
+            if (extensionEnabled(EXTsRGBName)) {
                 GLint value = 0;
                 webContext()->getFramebufferAttachmentParameteriv(target, attachment, pname, &value);
-                return WebGLAny(scriptState, value);
+                return WebGLAny(scriptState, static_cast<unsigned>(value));
             }
             synthesizeGLError(GL_INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for renderbuffer attachment");
             return ScriptValue::createNull(scriptState);
         default:
             synthesizeGLError(GL_INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for texture attachment");
             return ScriptValue::createNull(scriptState);
         }
     } else {
         switch (pname) {
         case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
@@ skipping 3711 matching lines @@
     return m_sharedWebGraphicsContext3D ? m_sharedWebGraphicsContext3D->drawingBuffer() : 0;
 }
 #else
 DrawingBuffer* WebGLRenderingContextBase::drawingBuffer() const
 {
     return m_drawingBuffer.get();
 }
 #endif
 
 } // namespace blink