Skia GN build.

DEPS

 use_relative_paths = True
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'pdfium_git': 'https://pdfium.googlesource.com',
 
-  'build_revision': '28e8fda8744c8c44bac72eee610642798daf2705',
-  'buildtools_revision': '5378d73123b64907773cc5c1bb027b2f765ff00a',
+  'build_revision': 'c557a3544d31513394681f40c8c2512cf7ddcb9e',
+  'buildtools_revision': '309289315767f615256eada4653b4917cf148c8e',
   'clang_revision': 'b6f620b311665e2d96d0921833f54295b9bbf925',
   'cygwin_revision': 'c89e446b273697fadf3a10ff1007a97c0b7de6df',
+  'gen_library_loader_revision': '916d4acd8b2cde67a390737dfba90b3c37de23a1',
   'gmock_revision': '29763965ab52f24565299976b936d1265cb6a271',
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',
   'icu_revision': 'c291cde264469b20ca969ce8832088acb21e0c48',
   'pdfium_tests_revision': '7e5050a49256a7350df9b8d7ad86e911eb83c021',
-  'skia_revision': '0a291c7b7eea1807bd58bdaa60c258fd0ebeb257',
+  'skia_revision': '6f47dbaff54a7705ef3e98f1f65c765e56fd9bd0',
   'trace_event_revision': 'd83d44b13d07c2fd0a40101a7deef9b93b841732',
   'v8_revision': '5cd0d8f27e3f740179a8a3de7b9d2c0cfae7afb9',
-
 }
 
 deps = {
   "build":
     Var('chromium_git') + "/chromium/src/build.git@" + Var('build_revision'),
 
   "buildtools":
     Var('chromium_git') + "/chromium/buildtools.git@" + Var('buildtools_revision'),
 
   "testing/corpus":
     Var('pdfium_git') + "/pdfium_tests@" + Var('pdfium_tests_revision'),
 
   "testing/gmock":
     Var('chromium_git') + "/external/googlemock.git@" + Var('gmock_revision'),
 
   "testing/gtest":
     Var('chromium_git') + "/external/googletest.git@" + Var('gtest_revision'),
 
   "third_party/icu":
     Var('chromium_git') + "/chromium/deps/icu.git@" + Var('icu_revision'),
 
   "third_party/skia":
     Var('chromium_git') + '/skia.git' + '@' +  Var('skia_revision'),
 
   "tools/clang":
     Var('chromium_git') + "/chromium/src/tools/clang@" +  Var('clang_revision'),
 
+  "tools/generate_library_loader":
+    Var('chromium_git') + "/chromium/src/tools/generate_library_loader@" +
+        Var('gen_library_loader_revision'),
+
   "tools/gyp":
     Var('chromium_git') + "/external/gyp",
 
   "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'),
 }
 
@@ skipping 113 matching lines @@
                '--if-needed'
     ],
   },
   {
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python', 'pdfium/build/vs_toolchain.py', 'update'],
   },
 ]