WebGL: add targets for WebGL 2 when check FBO targets

Source/core/html/canvas/WebGLRenderingContextBase.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 863 matching lines @@
     // Helper function for texParameterf and texParameteri.
     void texParameter(GLenum target, GLenum pname, GLfloat paramf, GLint parami, bool isFloat);
 
     // Helper function to print GL errors to console.
     void printGLErrorToConsole(const String&);
 
     // Helper function to print warnings to console. Currently
     // used only to warn about use of obsolete functions.
     void printWarningToConsole(const String&);
 
+    // Helper function to validate the target for checkFramebufferStatus and validateFramebufferFuncParameters.
+    virtual bool validateFramebufferTarget(GLenum target);
+
+    // Get the framebuffer bound to given target
+    virtual RefPtrWillBeMember<WebGLFramebuffer> getFramebufferBinding(GLenum target);

[Ken Russell (switch to Gerrit), 2015/04/30 01:41:51]

I don't think it's necessary or correct to return RefPtrWillBeMember<T> here.
You should just return a WebGLFramebuffer* here and call
m_framebufferBinding.get(). See https://www.chromium.org/blink/blink-gc and the
linked design document.

[yunchao, 2015/04/30 02:42:49]

Done.

+
     // Helper function to validate input parameters for framebuffer functions.
     // Generate GL error if parameters are illegal.
     bool validateFramebufferFuncParameters(const char* functionName, GLenum target, GLenum attachment);
 
     // Helper function to validate blend equation mode.
     bool validateBlendEquation(const char* functionName, GLenum);
 
     // Helper function to validate blend func factors.
     bool validateBlendFuncFactors(const char* functionName, GLenum src, GLenum dst);
 
@@ skipping 111 matching lines @@
     static IntSize oldestContextSize();
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::WebGLRenderingContextBase::TextureUnitState);
 
 #endif // WebGLRenderingContextBase_h