Roll WebGL 72e7ed9..4da7838

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/72e7ed9..4da7838

BUG=
TBR=cwallez@chromium.org
TEST=bots
NOTRY=true

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

Review-Url: https://codereview.chromium.org/2133693004
Cr-Commit-Position: refs/heads/master@{#404511}

DEPS

@@ -178,7 +178,7 @@ deps = {
     Var('chromium_git') + '/external/bidichecker/lib.git' + '@' + '97f2aa645b74c28c57eca56992235c79850fa9e0',
 
   'src/third_party/webgl/src':
-   Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '72e7ed9b25959b6d44652483000423b36120b114',
+   Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '4da7838a2303570d8a91bff810afd0920fd0e831',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -46,9 +46,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
 
     self.Flaky('conformance2/query/occlusion-query.html', bug=603168)
 
-    # Regression from https://github.com/KhronosGroup/WebGL/pull/1854.
-    self.Fail('deqp/functional/gles3/fbodepthbuffer.html', bug=483282)
-
     # Avoid a conflict with a Mac expectation by setting
     self.Fail('conformance2/textures/misc/tex-input-validation.html',
         ['d3d9', 'd3d11', 'opengl'], bug=483282)
@@ -103,8 +100,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
 
     # Windows 8 only.
 
-    self.Fail('conformance2/reading/read-pixels-from-fbo-test.html',
-        ['win8'], bug=483282)
     self.Flaky('deqp/functional/gles3/buffercopy.html', ['win8'], bug=587601)
 
     # Win / NVidia
@@ -502,6 +497,9 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/glsl3/vector-dynamic-indexing.html',
         ['linux'], bug=483282)
 
+    self.Fail('deqp/functional/gles3/fbodepthbuffer.html',
+        ['linux'], bug=483282)
+
     # Behavior difference between GL compatibility profile and ES3.
     self.Fail('conformance2/rendering/draw-buffers.html',
         ['linux'], bug=617410)