Linux: Add libunwind as a dependency of tcmalloc in 64 bit mode. (proposed so...

DEPS

 vars = {
   "webkit_trunk":
   "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "59831",
   "ffmpeg_revision": "47712",
   "skia_revision": "562",
   "chromium_git": "http://src.chromium.org/git",
   "swig_revision": "40423",
   "nacl_revision": "2235",
   "libvpx_revision": "47701",
@@ skipping 212 matching lines @@
 
     "src/third_party/xdg-utils":
       "/trunk/deps/third_party/xdg-utils@29103",
 
     # TODO(ajwong): Move this into the OS-independent block.
     "src/third_party/yasm/source/patched-yasm":
       "/trunk/deps/third_party/yasm/patched-yasm@29937",
 
     "src/third_party/swig/linux":
       "/trunk/deps/third_party/swig/linux@" + Var("swig_revision"),
+
+    "src/third_party/libunwind":
+      "/trunk/deps/third_party/libunwind@47716",
   },
 }
 
 
 include_rules = [
   # Everybody can use some things.
   "+base",
   "+build",
   "+ipc",
 
@@ skipping 26 matching lines @@
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Workaround XCode dependecies problem.
     # TODO(bradnelson): remove this when fixed.
     "pattern": ".",
     "action": ["python",
                "src/build/mac/clobber_generated_headers.py"],
   },
 ]