Integrate syzygy (optionally) into the chrome build process.

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": "92385",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
   # These hashes need to be updated when nacl_revision is changed.
@@ skipping 294 matching lines @@
     "src/third_party/mingw-w64/mingw/bin":
       (Var("nacl_trunk") + "/src/third_party/mingw-w64/mingw/bin@" +
        Var("nacl_tools_revision")),
 
     "src/rlz":
       (Var("googlecode_url") % "rlz") + "/trunk@44",
 
     # Dependencies used by libjpeg-turbo
     "src/third_party/yasm/binaries":
       "/trunk/deps/third_party/yasm/binaries@74228",
+
+    # Binary level profile guided optimizations.  This points to the
+    # latest release binaries for the toolchain.
+    "src/third_party/syzygy/binaries":
+      "https://sawbuck.googlecode.com/svn/trunk/syzygy/binaries@394",
   },
   "mac": {
     "src/chrome/tools/test/reference_build/chrome_mac":
       "/trunk/deps/reference_builds/chrome_mac@89574",
 
     "src/third_party/GTM":
       (Var("googlecode_url") % "google-toolbox-for-mac") + "/trunk@451",
     "src/third_party/pdfsqueeze":
       (Var("googlecode_url") % "pdfsqueeze") + "/trunk@4",
     "src/third_party/lighttpd":
@@ skipping 72 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")],
   },
 ]