Auto merge of #21683 - servo:webgl, r=jdm

Properly support PACK_ALIGNMENT in WebGL 1

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/21683)
<!-- Reviewable:end -->

tests/wpt/metadata/webgl/webgl1-idlharness.any.js.ini

@@ -1,7 +1,4 @@
 [webgl1-idlharness.any.worker.html]
-  [webgl1-idlharness]
-    expected: FAIL
-
   [WebGLRenderingContext interface: constant VERTEX_ATTRIB_ARRAY_ENABLED on interface prototype object]
     expected: FAIL
 
@@ -2443,9 +2440,6 @@
 
 
 [webgl1-idlharness.any.html]
-  [webgl1-idlharness]
-    expected: FAIL
-
   [WebGLRenderingContext interface: operation isContextLost()]
     expected: FAIL
 

tests/wpt/metadata/webgl/webgl1-idlharness.window.js.ini

@@ -1,7 +0,0 @@
-[webgl1-idlharness.window.html]
-  [webgl1-idlharness]
-    expected: FAIL
-
-  [WebGLRenderingContext interface: operation isContextLost()]
-    expected: FAIL
-

tests/wpt/metadata/webgl/webgl2-idlharness.any.js.ini

@@ -1,7 +1,4 @@
 [webgl2-idlharness.any.html]
-  [webgl2-idlharness]
-    expected: FAIL
-
   [WebGL2RenderingContext interface: constant DRAW_BUFFER0 on interface prototype object]
     expected: FAIL
 
@@ -2086,9 +2083,6 @@
 
 
 [webgl2-idlharness.any.worker.html]
-  [webgl2-idlharness]
-    expected: FAIL
-
   [WebGL2RenderingContext interface: constant DRAW_BUFFER0 on interface prototype object]
     expected: FAIL