Add fetch polyfill for use in all supported browsers

Additionally fix a bug in bower2buck.py where it would
bail when a license is not specified in a Bower package
info response.

[1] http://caniuse.com/#feat=fetch
[2] http://github.github.io/fetch/

Change-Id: Ibf754aab98bab6e34b7a9fb5d6c9801bb612f5d5

lib/BUCK

@@ -10,6 +10,7 @@ define_license(name = 'CC-BY3.0')
 define_license(name = 'clippy')
 define_license(name = 'codemirror')
 define_license(name = 'diffy')
+define_license(name = 'fetch')
 define_license(name = 'h2')
 define_license(name = 'jgit')
 define_license(name = 'jsch')

lib/LICENSE-fetch

@@ -0,0 +1,20 @@
+Copyright (c) 2014-2016 GitHub, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

lib/js/BUCK

@@ -75,6 +75,14 @@ npm_binary(
 # Use the same procedure as for adding dependencies, except just change the
 # version number of the existing bower_component rather than adding a new rule.
 
+bower_component(
+  name = 'fetch',
+  package = 'fetch',
+  version = '0.11.0',
+  license = 'fetch',
+  sha1 = 'a55d4e291821958d9d400bb3184c12bb367dc670',
+)
+
 bower_component(
   name = 'font-roboto',
   package = 'polymerelements/font-roboto',

polygerrit-ui/BUCK

@@ -3,6 +3,7 @@ include_defs('//lib/js.defs')
 bower_components(
   name = 'polygerrit_components',
   deps = [
+    '//lib/js:fetch',
     '//lib/js:iron-ajax',
     '//lib/js:iron-autogrow-textarea',
     '//lib/js:iron-dropdown',
@@ -11,5 +12,6 @@ bower_components(
     '//lib/js:iron-selector',
     '//lib/js:page',
     '//lib/js:polymer',
+    '//lib/js:promise-polyfill',
   ],
 )

tools/js/bower2buck.py

@@ -77,7 +77,7 @@ class Rule(object):
     self.name = bower_json['name']
     self.version = bower_json['version']
     self.deps = bower_json.get('dependencies', {})
-    self.license = bower_json['license']
+    self.license = bower_json.get('license', 'NO LICENSE')
     self.sha1 = util.hash_bower_component(
         hashlib.sha1(), os.path.dirname(bower_json_path)).hexdigest()