Roll WebGL a182a9a..3c1cb02

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/a182a9a..3c1cb02

Cq-Include-Trybots: master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.angle:linux_angle_rel_ng;master.tryserver.chromium.angle:win_angle_rel_ng
Change-Id: I1303a026e8c781b9acff25e9c7b73ca4ba4c9299
Reviewed-on: https://chromium-review.googlesource.com/946893
Commit-Queue: vikas soni <vikassoni@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540754}

DEPS

@@ -654,7 +654,7 @@ deps = {
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'a182a9ad3078aca566d8355eabf2d9f56f70ee82',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '3c1cb0203b6cfc10389e85a350b2ea6ca29d01ce',
 
   'src/third_party/webrtc':
     Var('webrtc_git') + '/src.git' + '@' + '12c8110e8c717b7f0f87615d3b99caac2a69fa6c', # commit position 21742

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -88,6 +88,8 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         'texturelodoffset.html',
         bug=794335)
 
+    self.Fail('conformance2/sync/sync-webgl-specific.html',
+        ['mac', 'win'], bug=818336)
     self.Fail('conformance2/textures/misc/copy-texture-image-same-texture.html',
         ['mac', 'linux'], bug=809233)
     self.Fail('conformance2/textures/misc/copy-texture-image-same-texture.html',
@@ -1249,7 +1251,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/textures/image_data/' +
         'tex-3d-rgb5_a1-rgba-unsigned_byte.html',
         ['linux', ('amd', 0x6613)], bug=701138)
-
     # Conflicting expectations to test that the
     # "Expectations have no collisions" unittest works.
     # page_name = 'conformance/glsl/constructors/glsl-construct-ivec4.html'

content/test/gpu/gpu_tests/webgl_conformance_revision.txt

 # AUTOGENERATED FILE - DO NOT EDIT
 # SEE roll_webgl_conformance.py
-Current webgl revision a182a9ad3078aca566d8355eabf2d9f56f70ee82
+Current webgl revision 3c1cb0203b6cfc10389e85a350b2ea6ca29d01ce