Roll WebGL e9afa18..a67124d

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/e9afa18..a67124d

BUG=672719
TEST=bots

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

Review-Url: https://codereview.chromium.org/2565543004
Cr-Commit-Position: refs/heads/master@{#437589}

DEPS

@@ -192,7 +192,7 @@ deps = {
     Var('chromium_git') + '/external/bidichecker/lib.git' + '@' + '97f2aa645b74c28c57eca56992235c79850fa9e0',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'e9afa18a05e09c7f692cf9258442c268eda9ad92',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'a67124d6ddc7e44ef25af1e52a6fe2f1a869a8cc',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -54,7 +54,11 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/rendering/depth-stencil-feedback-loop.html',
         bug=660844) # WebGL 2.0.1
     self.Fail('conformance2/rendering/rendering-sampling-feedback-loop.html',
-        bug=660844)
+        bug=660844) # WebGL 2.0.1
+    self.Fail('conformance2/rendering/read-draw-when-missing-image.html',
+        bug=672719) # WebGL 2.0.1
+    self.Fail('conformance2/glsl3/float-parsing.html',
+        bug=672722) # WebGL 2.0.1
     self.Fail('conformance2/textures/misc/' +
         'integer-cubemap-specification-order-bug.html',
         bug=483282) # owner:cwallez, test might be buggy