Add bindings for optional arguments to some WebGL2 methods.

Add bindings for optional arguments to some WebGL2 methods.
https://bugs.webkit.org/show_bug.cgi?id=177067

Reviewed by Antti Koivisto.

Add bindings for optional arguments to some WebGL2 methods.

No new tests: not much point in adding tests now; these methods don't
do anything anyway.

* html/canvas/WebGL2RenderingContext.cpp:
(WebCore::WebGL2RenderingContext::uniform1uiv):
(WebCore::WebGL2RenderingContext::uniform2uiv):
(WebCore::WebGL2RenderingContext::uniform3uiv):
(WebCore::WebGL2RenderingContext::uniform4uiv):
(WebCore::WebGL2RenderingContext::uniformMatrix2x3fv):
(WebCore::WebGL2RenderingContext::uniformMatrix3x2fv):
(WebCore::WebGL2RenderingContext::uniformMatrix2x4fv):
(WebCore::WebGL2RenderingContext::uniformMatrix4x2fv):
(WebCore::WebGL2RenderingContext::uniformMatrix3x4fv):
(WebCore::WebGL2RenderingContext::uniformMatrix4x3fv):
(WebCore::WebGL2RenderingContext::clearBufferiv):
(WebCore::WebGL2RenderingContext::clearBufferuiv):
(WebCore::WebGL2RenderingContext::clearBufferfv):
* html/canvas/WebGL2RenderingContext.h:
* html/canvas/WebGL2RenderingContext.idl:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@222258 268f45cc-cd09-0410-ab3c-d52691b4dbfc