Auto merge of #26787 - szeged:texi2d_3, r=jdm

Add support for WebGL2 TexImage2D

Adds initial support for one of the WebGL2 `TexImage2D` call.

I've enabled the `tests/wpt/webgl/tests/deqp/` tests.

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- [x] These changes fix part of #26512
- [x] There are tests for these changes

@mmatyas @zakorgy @jdm
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components/script/dom/webidls/WebGL2RenderingContext.webidl

@@ -505,9 +505,9 @@ interface mixin WebGL2RenderingContextOverloads
                      GLenum format, GLenum type, TexImageSource source); // May throw DOMException
 
   // WebGL2 entrypoints:
-  //[Throws]
-  //void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
-  //                GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+  [Throws]
+  void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                  GLint border, GLenum format, GLenum type, GLintptr pboOffset);
   [Throws]
   void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
                   GLint border, GLenum format, GLenum type,