Implement texture uploads from ImageBitmap with sub source.

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

Index: third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
index 17bc6bc458dc24e45412c0595e960606917e6528..d86b6a26f77fe12f68355152705ca7beba9a7626 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
@@ -465,7 +465,6 @@ class WebGL2RenderingContextBase : public WebGLRenderingContextBase {
                      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,
@@ -484,15 +483,6 @@ class WebGL2RenderingContextBase : public WebGLRenderingContextBase {
                      GLenum,
                      GLenum,
                      DOMArrayBufferView*);
-  void texSubImage3D(GLenum,
-                     GLint,
-                     GLint,
-                     GLint,
-                     GLint,
-                     GLenum,
-                     GLenum,
-                     ImageBitmap*,
-                     ExceptionState&);
 
   void copyTexSubImage3D(GLenum,
                          GLint,