Add spec links for WebGL IDL files

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl

 // Copyright 2015 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.
 
+// https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7

[Ken Russell (switch to Gerrit), 2017/04/06 20:29:24]

I wish we had symbolic anchors for all of these, but that needs to wait until we
switch to Bikeshed (which is planned).

[foolip, 2017/04/07 05:08:42]

Yes, using the section numbers for anything at all, especially an anchor, is the
opposite of great. Looking forward to Bikeshed :)

+
 typedef long long GLint64;
 typedef unsigned long long GLuint64;
 
 [
     NoInterfaceObject,
 ] interface WebGL2RenderingContextBase {
     const GLenum READ_BUFFER                                   = 0x0C02;
     const GLenum UNPACK_ROW_LENGTH                             = 0x0CF2;
     const GLenum UNPACK_SKIP_ROWS                              = 0x0CF3;
     const GLenum UNPACK_SKIP_PIXELS                            = 0x0CF4;
@@ skipping 510 matching lines @@
     WebGLVertexArrayObject? createVertexArray();
     void deleteVertexArray(WebGLVertexArrayObject? vertexArray);
     GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
     void bindVertexArray(WebGLVertexArrayObject? vertexArray);
 
     /* Reading */
     void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView dstData, GLintptr offset);
     void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLintptr offset);
 };
 WebGL2RenderingContextBase implements WebGLRenderingContextBase;