PolyGerrit: introduce gr-account-chip which supports a remove button.

Bug: Issue 3917
Change-Id: Ibe4d62786b0625bad34e651b715a2085c4a2da52

polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.html

@@ -0,0 +1,46 @@
+<!--
+Copyright (C) 2016 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<link rel="import" href="../../../bower_components/polymer/polymer.html">
+<link rel="import" href="../gr-account-link/gr-account-link.html">
+<link rel="import" href="../gr-button/gr-button.html">
+
+<dom-module id="gr-account-chip">
+  <template>
+    <style>
+      :host {
+        display: inline-block;
+        background: #ccc;
+        border-radius: .75em;
+      }
+      span.innerspan {
+        margin: .5em;
+      }
+      gr-button.remove {
+        padding: 0;
+        text-decoration: none;
+        background: #ccc;
+      }
+    </style>
+    <span class="innerspan">
+      <gr-account-link account="[[account]]"></gr-account-link>
+      <gr-button
+         hidden$="[[!removable]]" hidden
+         class="remove" on-tap="_handleRemoveTap">×</gr-button>
+    </span>
+  </template>
+  <script src="gr-account-chip.js"></script>
+</dom-module>

polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.js

@@ -0,0 +1,34 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function() {
+  'use strict';
+
+  Polymer({
+    is: 'gr-account-chip',
+
+    properties: {
+      account: Object,
+      removable: {
+        type: Boolean,
+        value: false,
+      },
+    },
+
+    _handleRemoveTap: function(e) {
+      e.preventDefault();
+      this.fire('remove', {account: this.account}, {bubbles: false});
+    },
+  });
+})();