Add gyp-target for Android guava library.

android_tools.gyp

Index: android_tools.gyp
diff --git a/android_tools.gyp b/android_tools.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..6e66e118402bd3f3f8a74451ba755a2ecb366684
--- /dev/null
+++ b/android_tools.gyp
@@ -0,0 +1,19 @@
+# Copyright (c) 2010 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.
+{
+  'targets': [
+    {
+      'target_name': 'android_guava',
+      'type' : 'none',
+      'all_dependent_settings': {
+        'variables': {
+          'input_jars_paths' : [
+            'sdk/tools/lib/guavalib.jar',
+          ],
+        }
+      }
+    },
+  ],
+}
+