Adding native client toolchain download to all chrome checkouts with nacl.

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": "93204",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
   # These hashes need to be updated when nacl_revision is changed.
   # After changing nacl_revision, run 'gclient runhooks' to get the new values.
   "nacl_irt_hash_x86_32": "c52ee520445831da8399e5c5bf05890a3f7edc19",
   "nacl_irt_hash_x86_64": "250f60b241a9b36320ae82f88ee15d6fbd2b46f2",
   "nacl_revision": "6447",
   # After changing nacl_revision, run 'glient sync' and check native_client/DEPS
   # to update other nacl_*_revision's.
   # TODO(brettw) We should use the "From" syntax to avoid hardcoding the
   # revisions here, but it makes checkdeps confused. We should fix checkdeps.
   "nacl_chrome_ppapi_revision": "96903", # native_client/DEPS: chrome_ppapi_rev 
   "nacl_tools_revision": "5360",  # native_client/DEPS: tools_rev
+
+  # These hashes need to be updated when nacl_toolchain_revision is changed.
+  # After changing nacl_toolchain_revision, run 'gclient runhooks' to get the
+  # new values.
+  "nacl_toolchain_mac_x86_newlib_hash":
+      "be4cc2baf6eb34c8fe155a1bb61e2acd8ca1e924",
+  "nacl_toolchain_win_x86_newlib_hash":
+      "56667d7f653b1005cd5116de3d8e9faf346053cf",
+  "nacl_toolchain_linux_x86_newlib_hash":
+      "5e4876a1fa53c7701cdbeef969a99b3ff0b0ddc5",
+  "nacl_toolchain_revision": "6429",
+
   "libjingle_revision": "77",
   "libvpx_revision": "96377",
   "ffmpeg_revision": "96868",
   "sfntly_revision": "54",
   "skia_revision": "2128",
   "v8_revision": "8933",
   "webrtc_revision": "242",
 
   # Note: On most bots, clang is not checked out via DEPS but by
   # tools/clang/scripts/update.sh. The script reads this line here.
@@ skipping 376 matching lines @@
   },
   {
     # This downloads binaries for Native Client's integrated runtime (IRT)
     # library, which is built as NaCl untrusted code.
     "pattern": ".",
     "action": ["python", "src/build/download_nacl_irt.py",
                "--nacl_revision", Var("nacl_revision"),
                "--file_hash", "x86_32", Var("nacl_irt_hash_x86_32"),
                "--file_hash", "x86_64", Var("nacl_irt_hash_x86_64")],
   },
+  {
+    # 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.
+    "pattern": ".",
+    "action": [
+        "python", "src/build/download_nacl_toolchains.py",
+         "--x86-version", Var("nacl_toolchain_revision"),
+         "--nacl-newlib-only",
+         "--file-hash", "mac_x86_newlib",
+             Var("nacl_toolchain_mac_x86_newlib_hash"),
+         "--file-hash", "win_x86_newlib",
+             Var("nacl_toolchain_win_x86_newlib_hash"),
+         "--file-hash", "linux_x86_newlib",
+             Var("nacl_toolchain_linux_x86_newlib_hash"),
+    ],
+  },
 ]