Add initial support for WebGL2 uniform buffer functions

Adds initial support for the following WebGL2 calls:

- bindBufferBase
- bindBufferRange
- getUniformIndices
- getUniformBlockIndex
- getActiveUniforms
- getActiveUniformBlockParameter
- getActiveUniformBlockName
- uniformBlockBinding

See: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.16

tests/wpt/webgl/meta/conformance2/uniforms/dependent-buffer-change.html.ini

@@ -1,5 +0,0 @@
-[dependent-buffer-change.html]
-  expected: ERROR
-  [WebGL test #1: successfullyParsed should be true (of type boolean). Was undefined (of type undefined).]
-    expected: FAIL
-

tests/wpt/webgl/meta/conformance2/uniforms/draw-with-uniform-blocks.html.ini

@@ -1,5 +0,0 @@
-[draw-with-uniform-blocks.html]
-  expected: ERROR
-  [WebGL test #1: successfullyParsed should be true (of type boolean). Was undefined (of type undefined).]
-    expected: FAIL
-

tests/wpt/webgl/meta/conformance2/uniforms/query-uniform-blocks-after-shader-detach.html.ini

@@ -1,5 +0,0 @@
-[query-uniform-blocks-after-shader-detach.html]
-  expected: ERROR
-  [WebGL test #2: successfullyParsed should be true (of type boolean). Was undefined (of type undefined).]
-    expected: FAIL
-

tests/wpt/webgl/meta/conformance2/uniforms/simple-buffer-change.html.ini

@@ -1,5 +0,0 @@
-[simple-buffer-change.html]
-  expected: ERROR
-  [WebGL test #1: successfullyParsed should be true (of type boolean). Was undefined (of type undefined).]
-    expected: FAIL
-

tests/wpt/webgl/meta/conformance2/uniforms/uniform-blocks-with-arrays.html.ini

@@ -1,5 +0,0 @@
-[uniform-blocks-with-arrays.html]
-  expected: ERROR
-  [WebGL test #0: successfullyParsed should be true (of type boolean). Was undefined (of type undefined).]
-    expected: FAIL
-