Auto-updating script for Windows toolchain

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 623 matching lines @@
   },
   {
     # Update LASTCHANGE.blink. This is also run by export_tarball.py in
     # src/tools/export_tarball - please keep them in sync.
     "name": "lastchange",
     "pattern": ".",
     "action": ["python", "src/build/util/lastchange.py",
                "-s", "src/third_party/WebKit",
                "-o", "src/build/util/LASTCHANGE.blink"],
   },
+  # Windows toolchain setup.
+  {
+    "name": "toolchain_win",
+    "pattern": "\\.sha1$",

[M-A Ruel, 2013/11/26 16:09:50]

third_party/win_toolchain/toolchain\\.sha1

[scottmg, 2013/11/26 17:41:29]

Done.

+    "action": [ "python",
+                "src/tools/win/toolchain/get_toolchain_if_necessary.py",
+    ],
+  },
   # Pull GN binaries. This needs to be before running GYP below.
   {
     "name": "gn_win",
     "pattern": "src/tools/gn/bin/win/gn.exe.sha1",
     "action": [ "download_from_google_storage",
                 "--no_resume",
                 "--platform=win32",
                 "--no_auth",
                 "--bucket", "chromium-gn",
                 "-s", "src/tools/gn/bin/win/gn.exe.sha1",
@@ skipping 27 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"],
   },
 ]