Update Polymer from 1.2.1 -> 1.2.3

third_party/polymer/v1_0/components-chromium/paper-dialog/README.md

-# paper-dialog
 
-A Material Design dialog
+<!---
+
+This README is automatically generated from the comments in these files:
+paper-dialog.html
+
+Edit those files, and our readme bot will duplicate them over here!
+Edit this file, and the bot will squash your changes :)
+
+-->
+
+[![Build Status](https://travis-ci.org/PolymerElements/paper-dialog.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-dialog)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-dialog)_
+
+
+##&lt;paper-dialog&gt;
+
+
+Material design: [Dialogs](https://www.google.com/design/spec/components/dialogs.html)
+
+`<paper-dialog>` is a dialog with Material Design styling and optional animations when it is
+opened or closed. It provides styles for a header, content area, and an action area for buttons.
+You can use the `<paper-dialog-scrollable>` element (in its own repository) if you need a scrolling
+content area. See `Polymer.PaperDialogBehavior` for specifics.
+
+For example, the following code implements a dialog with a header, scrolling content area and
+buttons.
+
+    <paper-dialog>
+      <h2>Header</h2>
+      <paper-dialog-scrollable>
+        Lorem ipsum...
+      </paper-dialog-scrollable>
+      <div class="buttons">
+        <paper-button dialog-dismiss>Cancel</paper-button>
+        <paper-button dialog-confirm>Accept</paper-button>
+      </div>
+    </paper-dialog>
+
+### Styling
+
+See the docs for `Polymer.PaperDialogBehavior` for the custom properties available for styling
+this element.
+
+### Animations
+
+Set the `entry-animation` and/or `exit-animation` attributes to add an animation when the dialog
+is opened or closed. See the documentation in
+[PolymerElements/neon-animation](https://github.com/PolymerElements/neon-animation) for more info.
+
+For example:
+
+    <link rel="import" href="components/neon-animation/animations/scale-up-animation.html">
+    <link rel="import" href="components/neon-animation/animations/fade-out-animation.html">
+
+    <paper-dialog entry-animation="scale-up-animation"
+                  exit-animation="fade-out-animation">
+      <h2>Header</h2>
+      <div>Dialog body</div>
+    </paper-dialog>
+
+### Accessibility
+
+See the docs for `Polymer.PaperDialogBehavior` for accessibility features implemented by this
+element.
+
+