Add GN for sandbox_linux_jni_unittests

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 54 matching lines @@
     "//media/blink",
     "//media/cast",
     "//media/mojo",
     "//mojo",
     "//net",
     "//pdf",
     "//ppapi/examples",
     "//printing",
     "//remoting/client/plugin",
     "//sandbox",
+    "//sandbox/linux:sandbox_linux_jni_unittests",

[brettw, 2015/02/20 23:05:48]

I don't think you need to add this line. We'll find it automatically when we
parse the file.

     "//sdch",
     "//skia",
     "//storage/browser",
     "//sql",
     "//sync",
     "//third_party/WebKit/public:all_blink",
     "//third_party/angle:translator",
     "//third_party/brotli",
     "//third_party/cacheinvalidation",
     "//third_party/cld",
@@ skipping 210 matching lines @@
       "//ui/views",
       "//ui/views/controls/webview",
       "//ui/web_dialogs",
     ]
   }
 
   if (is_mac || is_ios) {
     deps -= [ "//ui/touch_selection" ]
   }
 }