Roll WebGL d0fcf3d..a503e42

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/d0fcf3d..a503e42

Tbr: kbr@chromium.org
Bug: 1099955,1107994,1078330,1108044
Bug: 1058160,1100834,890539, 1108086
Bug: angleproject:4849, angleproject:4807, angleproject:4754
Change-Id: I1765c384d2f6fb4bf4ba08e8858ba58e8d32e561
Cq-Include-Trybots: luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-angle-rel;luci.chromium.try:win-angle-rel-32;luci.chromium.try:win-angle-rel-64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310835
Commit-Queue: Shrek Shao <shrekshao@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790706}

DEPS

@@ -1460,7 +1460,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/SeleniumHQ/selenium/py.git' + '@' + 'd0045ec570c1a77612db35d1e92f05e1d27b4d53',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'd0fcf3daa5f98402f63e0e99a48fc60a4be18cf1',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'a503e4226c7b1095f2e8a0051021f0b20bbe585b',
 
   'src/third_party/webgpu-cts/src':
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '6371fe6f1acf4b614155acfb468dec4c55c50d27',

content/test/gpu/gpu_tests/test_expectations/webgl2_conformance_expectations.txt

@@ -68,6 +68,10 @@ crbug.com/891861 [ android no-passthrough ] WebglExtension_WEBGL_multi_draw_inst
 # Conformance expectations
 # ========================
 
+# Failing new updated tests
+crbug.com/1108044 conformance2/renderbuffers/readbuffer.html [ Failure ]
+crbug.com/1108086 [ no-passthrough ] conformance2/renderbuffers/framebuffer-object-attachment.html [ Failure ]
+crbug.com/angleproject/4807 [ win passthrough ] conformance2/glsl3/switch-case.html [ Failure ]
 crbug.com/1081973 conformance/buffers/buffer-data-and-buffer-sub-data.html [ Failure ]
 crbug.com/1082455 [ win ] conformance2/renderbuffers/multisampled-depth-renderbuffer-initialization.html [ Failure ]
 crbug.com/1082455 [ linux ] conformance2/renderbuffers/multisampled-depth-renderbuffer-initialization.html [ Failure ]

content/test/gpu/gpu_tests/webgl_conformance_revision.txt

 # AUTOGENERATED FILE - DO NOT EDIT
 # SEE roll_webgl_conformance.py
-Current webgl revision d0fcf3daa5f98402f63e0e99a48fc60a4be18cf1
+Current webgl revision a503e4226c7b1095f2e8a0051021f0b20bbe585b