Add iossim testing tool for running iOS unit tests.

DEPS

 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 
 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",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
@@ skipping 394 matching lines @@
     "src/third_party/nacl_sdk_binaries":
       "/trunk/deps/third_party/nacl_sdk_binaries@111576",
   },
   "ios": {
     "src/third_party/GTM":
       (Var("googlecode_url") % "google-toolbox-for-mac") + "/trunk@" +
       Var("gtm_revision"),
 
     "src/third_party/nss":
       "/trunk/deps/third_party/nss@" + Var("nss_revision"),
+
+    # class-dump utility to generate header files for undocumented SDKs
+    "src/testing/iossim/third_party/class-dump":
+      "/trunk/deps/third_party/class-dump@147231",
   },
   "mac": {
     "src/chrome/tools/test/reference_build/chrome_mac":
       "/trunk/deps/reference_builds/chrome_mac@137727",
 
     "src/third_party/GTM":
       (Var("googlecode_url") % "google-toolbox-for-mac") + "/trunk@" +
       Var("gtm_revision"),
     "src/third_party/pdfsqueeze":
       (Var("googlecode_url") % "pdfsqueeze") + "/trunk@4",
@@ skipping 139 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/util/lastchange.py",
                "-o", "src/build/util/LASTCHANGE"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]