Add webdriver py bindings to functional.DEPS.

DEPS

 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
   "webkit_revision": "93781",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
   "nacl_revision": "6539",
@@ skipping 206 matching lines @@
   "src/chrome/test/data/layout_tests/LayoutTests/http/tests/filesystem":
     Var("webkit_trunk") + "/LayoutTests/http/tests/filesystem@" +
     Var("webkit_revision"),
 
   "src/third_party/swig/Lib":
     "/trunk/deps/third_party/swig/Lib@" + Var("swig_revision"),
 
   # WebDriver keeps client and test code separate, and merges when the
   # python egg is installed. We run tests directly from src, so import
   # the code into the structure expected by the tests.
+  # Make sure you update chrome/test/functional.DEPS/DEPS too.
   "src/third_party/webdriver/python/selenium":
     "http://selenium.googlecode.com/svn/trunk/py/selenium@13487",
   "src/third_party/webdriver/python/selenium/test":
     "http://selenium.googlecode.com/svn/trunk/py/test@13487",
 
   "src/third_party/libvpx":
     "/trunk/deps/third_party/libvpx@" +
     Var("libvpx_revision"),
 
   "src/third_party/ffmpeg":
@@ skipping 178 matching lines @@
          "--file-hash", "linux_x86_newlib",
              Var("nacl_toolchain_linux_x86_newlib_hash"),
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]