Revert of Polymer: Remove unused paper-dialog and paper-dialog-behavior.

third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/paper-dialog-behavior-extracted.js

+/**
+Use `Polymer.PaperDialogBehavior` and `paper-dialog-shared-styles.html` 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-shared-styles.html` 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. If the user dismisses the dialog with `dialog-confirm`, the `closingReason` will update
+to include `confirmed: true`.
+
+### 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 prevent the focus from exiting the element.
+It will also ensure that focus remains in the dialog.
+
+@hero hero.svg
+@demo demo/index.html
+@polymerBehavior Polymer.PaperDialogBehavior
+*/
+
+  Polymer.PaperDialogBehaviorImpl = {
+
+    hostAttributes: {
+      'role': 'dialog',
+      'tabindex': '-1'
+    },
+
+    properties: {
+
+      /**
+       * If `modal` is true, this implies `no-cancel-on-outside-click`, `no-cancel-on-esc-key` and `with-backdrop`.
+       */
+      modal: {
+        type: Boolean,
+        value: false
+      }
+
+    },
+
+    observers: [
+      '_modalChanged(modal, _readied)'
+    ],
+
+    listeners: {
+      'tap': '_onDialogClick'
+    },
+
+    ready: function () {
+      // Only now these properties can be read.
+      this.__prevNoCancelOnOutsideClick = this.noCancelOnOutsideClick;
+      this.__prevNoCancelOnEscKey = this.noCancelOnEscKey;
+      this.__prevWithBackdrop = this.withBackdrop;
+    },
+
+    _modalChanged: function(modal, readied) {
+      // modal implies noCancelOnOutsideClick, noCancelOnEscKey and withBackdrop.
+      // We need to wait for the element to be ready before we can read the
+      // properties values.
+      if (!readied) {
+        return;
+      }
+
+      if (modal) {
+        this.__prevNoCancelOnOutsideClick = this.noCancelOnOutsideClick;
+        this.__prevNoCancelOnEscKey = this.noCancelOnEscKey;
+        this.__prevWithBackdrop = this.withBackdrop;
+        this.noCancelOnOutsideClick = true;
+        this.noCancelOnEscKey = true;
+        this.withBackdrop = true;
+      } else {
+        // If the value was changed to false, let it false.
+        this.noCancelOnOutsideClick = this.noCancelOnOutsideClick &&
+          this.__prevNoCancelOnOutsideClick;
+        this.noCancelOnEscKey = this.noCancelOnEscKey &&
+          this.__prevNoCancelOnEscKey;
+        this.withBackdrop = this.withBackdrop && this.__prevWithBackdrop;
+      }
+    },
+
+    _updateClosingReasonConfirmed: function(confirmed) {
+      this.closingReason = this.closingReason || {};
+      this.closingReason.confirmed = confirmed;
+    },
+
+    /**
+     * Will dismiss the dialog if user clicked on an element with dialog-dismiss
+     * or dialog-confirm attribute.
+     */
+    _onDialogClick: function(event) {
+      // Search for the element with dialog-confirm or dialog-dismiss,
+      // from the root target until this (excluded).
+      var path = Polymer.dom(event).path;
+      for (var i = 0; i < path.indexOf(this); i++) {
+        var target = path[i];
+        if (target.hasAttribute && (target.hasAttribute('dialog-dismiss') || target.hasAttribute('dialog-confirm'))) {
+          this._updateClosingReasonConfirmed(target.hasAttribute('dialog-confirm'));
+          this.close();
+          event.stopPropagation();
+          break;
+        }
+      }
+    }
+
+  };
+
+  /** @polymerBehavior */
+  Polymer.PaperDialogBehavior = [Polymer.IronOverlayBehavior, Polymer.PaperDialogBehaviorImpl];