Add initial dependencies on the w3c test repos (no tests yet).

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git
 #   gclient runhooks
 # DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
 # a bot when you modify this one.
@@ skipping 71 matching lines @@
   "src/third_party/angle":
     Var("chromium_git") +
     "/angle/angle.git@95fa672f26db492aee2076b0acb524149d52c68f",
 
   "src/third_party/trace-viewer":
     (Var("googlecode_url") % "trace-viewer") + "/trunk@1069",
 
   "src/third_party/WebKit":
     Var("webkit_trunk") + "@" + Var("webkit_revision"),
 
+  "src/third_party/WebKit/LayoutTests/w3c/web-platform-tests":
+    Var("chromium_git") +
+    "/external/w3c/web-platform-tests.git@35a9c0f1348052303a03523781c26ca98572ffa7",
+
+  "src/third_party/WebKit/LayoutTests/w3c/csswg-test":
+    Var("chromium_git") +
+    "/external/w3c/csswg-test.git@8c415e3215a203fa3a22dbdd1799279fdf44c81e",
+
   "src/third_party/icu":
     "/trunk/deps/third_party/icu46@241739",
 
   "src/third_party/libexif/sources":
     "/trunk/deps/third_party/libexif/sources@146817",
 
   "src/third_party/hunspell":
    "/trunk/deps/third_party/hunspell@206172",
 
   "src/third_party/hunspell_dictionaries":
@@ skipping 601 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "name": "landmines",
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]