Implement texture uploads from ImageBitmap with sub source.

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

 // 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.
 
 #ifndef WebGL2RenderingContextBase_h
 #define WebGL2RenderingContextBase_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/TraceWrapperMember.h"
 #include "modules/webgl/WebGLExtension.h"
@@ skipping 447 matching lines @@
                      GLint,
                      GLint,
                      GLsizei,
                      GLsizei,
                      GLsizei,
                      GLenum,
                      GLenum,
                      ImageBitmap*,
                      ExceptionState&);
 
-  // TODO(zmo): Obsolete, remove after WebGL2 conformance tests are updated.
   void texImage2D(GLenum,

[Ken Russell (switch to Gerrit), 2016/11/17 07:48:45]

I think these two texImage2D and texSubImage2D declarations should be moved up
into the section above:

"// Have to re-declare/re-define the following tex{Sub}Image2D functions
from..."

Not a big deal; this can wait for a follow-up patch.

                   GLint,
                   GLint,
                   GLsizei,
                   GLsizei,
                   GLint,
                   GLenum,
                   GLenum,
                   DOMArrayBufferView*);
   void texSubImage2D(GLenum,
                      GLint,
                      GLint,
                      GLint,
                      GLsizei,
                      GLsizei,
                      GLenum,
                      GLenum,
                      DOMArrayBufferView*);
-  void texSubImage3D(GLenum,
-                     GLint,
-                     GLint,
-                     GLint,
-                     GLint,
-                     GLenum,
-                     GLenum,
-                     ImageBitmap*,
-                     ExceptionState&);
 
   void copyTexSubImage3D(GLenum,
                          GLint,
                          GLint,
                          GLint,
                          GLint,
                          GLint,
                          GLint,
                          GLsizei,
                          GLsizei);
@@ skipping 424 matching lines @@
                   context,
                   context->is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(context) >= 2,
                   context.is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(&context) >=
                           2);
 
 }  // namespace blink
 
 #endif