Use lkgr revision of Clang for PDFium

DEPS

 use_relative_paths = True
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'pdfium_git': 'https://pdfium.googlesource.com',
 
   'buildtools_revision': 'c2f259809d5ede3275df5ea0842f0431990c4f98',
+  'clang_revision': '87058e09f9c547eb5d00cb8ca666c6aec203a117',
   'cygwin_revision': 'c89e446b273697fadf3a10ff1007a97c0b7de6df',
   'gmock_revision': '29763965ab52f24565299976b936d1265cb6a271',
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',
   'icu_revision': 'c291cde264469b20ca969ce8832088acb21e0c48',
   'pdfium_tests_revision': 'eb87214cb2088536e96aae517f3a281818fbf5b0',
   'skia_revision': '0a291c7b7eea1807bd58bdaa60c258fd0ebeb257',
   'trace_event_revision': 'd83d44b13d07c2fd0a40101a7deef9b93b841732',
   'v8_revision': '47bcec782b752ba411bd8bba6e390d1cc1c3226e',
 
 }
@@ skipping 11 matching lines @@
   "testing/gmock":
     Var('chromium_git') + "/external/googlemock.git@" + Var('gmock_revision'),
 
   "testing/gtest":
     Var('chromium_git') + "/external/googletest.git@" + Var('gtest_revision'),
 
   "third_party/skia":
     Var('chromium_git') + '/skia.git' + '@' +  Var('skia_revision'),
 
   "tools/clang":
-    Var('chromium_git') + "/chromium/src/tools/clang",
+    Var('chromium_git') + "/chromium/src/tools/clang@" +  Var('clang_revision'),
 
   "v8":
     Var('chromium_git') + "/v8/v8.git@" + Var('v8_revision'),
 
   "v8/base/trace_event/common":
     Var('chromium_git') + "/chromium/src/base/trace_event/common.git@" + Var('trace_event_revision'),
 
   "v8/third_party/icu":
     Var('chromium_git') + "/chromium/deps/icu.git@" + Var('icu_revision'),
 }
@@ skipping 87 matching lines @@
                 '-s', 'pdfium/buildtools/linux64/clang-format.sha1',
     ],
   },
   {
     # Pull clang if needed or requested via GYP_DEFINES.
     'name': 'clang',
     'pattern': '.',
     'action': ['python', 'pdfium/tools/clang/scripts/update.py', '--if-needed'],
   },
 ]