Add BUILD.gn for third_party/yasm.

BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 30 matching lines @@
     "//third_party/icu",
     "//third_party/leveldatabase",
     "//third_party/libpng",
     "//third_party/libusb",
     "//third_party/libwebp",
     "//third_party/re2",
     "//third_party/smhasher:cityhash",
     "//third_party/smhasher:murmurhash3",
     "//third_party/smhasher:pmurhash",
     "//third_party/WebKit/Source/wtf",
+    # TODO(ajwong): Reenable yasm once gn has action dependencies.

[brettw, 2014/05/09 20:17:54]

This should be fixed now.

[awong, 2014/05/10 08:55:34]

Done.

+    #"//third_party/yasm",
     "//third_party/zlib",
     "//tools/gn",
     "//ui/base:ui_base",
     "//ui/base/strings",
     "//ui/events",
     "//ui/gfx",
     "//ui/resources",
     "//url",
   ]
 
@@ skipping 11 matching lines @@
       "//skia",
       "//third_party/libusb",
       "//third_party/WebKit/Source/wtf",  # TODO(brettw) re-enable for Android.
       "//tools/gn",
       "//ui/base:ui_base",
       "//ui/events",
       "//ui/gfx",
     ]
   }
 }