Fix double-underscore shader conformance tests

sdk/tests/conformance/glsl/misc/shader-with-double-underscore.html

@@ -20,15 +20,18 @@
 <div id="console"></div>
 <script id="vertexShader" type="text/something-not-javascript">
 // vertex shader that uses double-underscore in identifier should succeed
-attribute vec4 foo__bar;
+attribute vec4 position;
+varying vec4 foo__bar;
 void main()
 {
-    gl_Position = foo__bar;
+    foo__bar = position;
+    gl_Position = position;
 }
 </script>
 <script id="fragmentShader" type="text/something-not-javascript">
 // fragment shader that uses double-underscore in identifier should succeed
-attribute vec4 foo__bar;
+precision mediump float;
+varying vec4 foo__bar;
 void main()
 {
     gl_FragColor = foo__bar;

sdk/tests/conformance/glsl/misc/shader-with-reserved-words.html

@@ -188,8 +188,6 @@
   "cast",
   "namespace",
   "using",
-  "__foo",      // something that has 2 underscores
-  "foo__bar",   // something that has 2 underscores
   "gl_foo",     // something that starts with gl_
   "webgl_foo"   // something that starts with webgl_
 ];