Bug 1302199 - Disable dom/canvas/test/webgl-mochitest/test_pixel_pack_buffer.html on windows for frequent failures. r=me, a=test-only

dom/canvas/test/webgl-mochitest/mochitest.ini

@@ -75,6 +75,7 @@ fail-if = (os == 'win' && os_version == '5.1')
 skip-if = android_version == '18' #Android 4.3 aws only; bug 1030942
 [test_noprog_draw.html]
 [test_pixel_pack_buffer.html]
+skip-if = os == "win" && os_version == "10.0" # Bug 1302199
 [test_privileged_exts.html]
 [test_renderer_strings.html]
 [test_sab_with_webgl.html]