gclient hook that downloads go binaries

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 -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 320 matching lines @@
     # This downloads binaries for Native Client's newlib toolchain.
     # Done in lieu of building the toolchain from scratch as it can take
     # anywhere from 30 minutes to 4 hours depending on platform to build.
     'name': 'nacltools',
     'pattern': '.',
     'action': [
         'python', 'src/build/download_nacl_toolchains.py',
         '--packages', 'pnacl_newlib',
         'sync', '--extract',
     ],
-  }
+  },
+  {
+    # This downloads linux and android Go binaries according to
+    # tools/go/VERSION.
+    'name': 'gotools',
+    'pattern': '.',
+    'action': [
+        'python', 'src/tools/go/download.py',
+    ],
+  },
 ]