Update Polymer from 1.2.1 -> 1.2.3

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

Index: third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/README.md
diff --git a/third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/README.md b/third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/README.md
index 2c63d3cdaadab1972a6d74c28a5abae0ca884d33..af0983d677b3dd15620c07ecd2eaf5f279d4aa99 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/README.md
+++ b/third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/README.md
@@ -1,24 +1,64 @@
-# paper-dialog-behavior
 
-`paper-dialog-behavior` implements behavior related to a Material Design dialog. Use this behavior
-and include `paper-dialog-common.css` in your element to implement a dialog.
+<!---
+
+This README is automatically generated from the comments in these files:
+paper-dialog-behavior.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-behavior.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-dialog-behavior)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-dialog-behavior)_
+
+
+##Polymer.PaperDialogBehavior
+
+
+Use `Polymer.PaperDialogBehavior` and `paper-dialog-common.css` to implement a Material Design
+dialog.
+
+For example, if `<paper-dialog-impl>` implements this behavior:
+
+    <paper-dialog-impl>
+        <h2>Header</h2>
+        <div>Dialog body</div>
+        <div class="buttons">
+            <paper-button dialog-dismiss>Cancel</paper-button>
+            <paper-button dialog-confirm>Accept</paper-button>
+        </div>
+    </paper-dialog-impl>
 
 `paper-dialog-common.css` provide styles for a header, content area, and an action area for buttons.
 Use the `<h2>` tag for the header and the `buttons` class for the action area. You can use the
 `paper-dialog-scrollable` element (in its own repository) if you need a scrolling content area.
 
 Use the `dialog-dismiss` and `dialog-confirm` attributes on interactive controls to close the
-dialog.
+dialog. If the user dismisses the dialog with `dialog-confirm`, the `closingReason` will update
+to include `confirmed: true`.
+
+### Styling
+
+The following custom properties and mixins are available for styling.
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-dialog-background-color` | Dialog background color                     | `--primary-background-color`
+`--paper-dialog-color`            | Dialog foreground color                     | `--primary-text-color`
+`--paper-dialog`                  | Mixin applied to the dialog                 | `{}`
+`--paper-dialog-title`            | Mixin applied to the title (`<h2>`) element | `{}`
+`--paper-dialog-button-color`     | Button area foreground color                | `--default-primary-color`
+
+### Accessibility
+
+This element has `role="dialog"` by default. Depending on the context, it may be more appropriate
+to override this attribute with `role="alertdialog"`.
+
+If `modal` is set, the element will set `aria-modal` and prevent the focus from exiting the element.
+It will also ensure that focus remains in the dialog.
+
+The `aria-labelledby` attribute will be set to the header element, if one exists.
 
-For example, if `<paper-dialog-impl>` implements this behavior:
 
-```html
-<paper-dialog-impl>
-    <h2>Header</h2>
-    <div>Dialog body</div>
-    <div class="buttons">
-        <paper-button dialog-dismiss>Cancel</paper-button>
-        <paper-button dialog-confirm>Accept</paper-button>
-    </div>
-</paper-dialog-impl>
-```