Roll WebGL d3f9e2b..f70ad1e

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/d3f9e2b..f70ad1e

BUG=
TEST=bots
CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.linux:linux_optional_gpu_tests_rel
TBR=kbr@chromium.org

Review URL: https://codereview.chromium.org/1897593002

Cr-Commit-Position: refs/heads/master@{#387795}

DEPS

@@ -180,7 +180,7 @@ deps = {
     Var('chromium_git') + '/external/bidichecker/lib.git' + '@' + '97f2aa645b74c28c57eca56992235c79850fa9e0',
 
   'src/third_party/webgl/src':
-   Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'd3f9e2bac23f44dfe53c9b719345ef31e771e6bd',
+   Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'f70ad1e4dd026599aea7e0b7c11bf82eabdb34f2',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -332,8 +332,8 @@ def SetExpectations(self):
         ['mac'], bug=295792)
     self.Fail('conformance2/renderbuffers/framebuffer-test.html',
         ['mac'], bug=483282)
-    self.Fail('conformance2/renderbuffers/readbuffer.html',
-        ['mac'], bug=570453)
+    self.Fail('conformance2/rendering/framebuffer-completeness-unaffected.html',
+        ['mac'], bug=604053)
 
     # Mac Retina NVIDIA
     self.Fail('conformance2/rendering/draw-buffers.html',