Roll WebGL 12b543b..5888a9f

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 165 matching lines @@
   'src/chrome/test/data/perf/canvas_bench':
    Var('chromium_git') + '/chromium/canvas_bench.git' + '@' + 'a7b40ea5ae0239517d78845a5fc9b12976bfc732',
 
   'src/chrome/test/data/perf/frame_rate/content':
    Var('chromium_git') + '/chromium/frame_rate/content.git' + '@' + 'c10272c88463efeef6bb19c9ec07c42bc8fe22b9',
 
   'src/third_party/bidichecker':
     Var('chromium_git') + '/external/bidichecker/lib.git' + '@' + '97f2aa645b74c28c57eca56992235c79850fa9e0',
 
   'src/third_party/webgl/src':
-   Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '12b543b09055c42ee49b08427caa7f7d84e45dc2',
+   Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '5888a9fb34a12aaf481b788550af836f6b5a3b65',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',
 
   'src/third_party/libvpx/source/libvpx':
    Var('chromium_git') + '/webm/libvpx.git' + '@' +  'e66cd132f09e6303c1746a7c071fb742c3cca637',
 
   'src/third_party/ffmpeg':
    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '35740fc7b72ac1d9adff69e67f3f61b639484dc3',
 
@@ skipping 823 matching lines @@
                 "--no_auth",
                 "-u",
                 "--bucket", "v8-wasm-asmjs-fuzzer",
                 "-s", "src/v8/test/fuzzer/wasm_asmjs.tar.gz.sha1",
     ],
   },
 ]
 
 # ANGLE manages DEPS that it also owns the build files for, such as dEQP.
 recursedeps = [("src/third_party/angle", "DEPS.chromium")]