Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components-chromium/iron-overlay-behavior/iron-overlay-backdrop-extracted.js

Index: third_party/polymer/v0_8/components-chromium/iron-overlay-behavior/iron-overlay-backdrop-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/iron-overlay-behavior/iron-overlay-backdrop-extracted.js b/third_party/polymer/v0_8/components-chromium/iron-overlay-behavior/iron-overlay-backdrop-extracted.js
new file mode 100644
index 0000000000000000000000000000000000000000..f3fd930bb916b4a6e5f81d9c7042f63d64e6de40
--- /dev/null
+++ b/third_party/polymer/v0_8/components-chromium/iron-overlay-behavior/iron-overlay-backdrop-extracted.js
@@ -0,0 +1,71 @@
+
+
+(function() {
+
+  Polymer({
+
+    is: 'iron-overlay-backdrop',
+
+    properties: {
+
+      /**
+       * Returns true if the backdrop is opened.
+       */
+      opened: {
+        readOnly: true,
+        reflectToAttribute: true,
+        type: Boolean,
+        value: false
+      },
+
+      _manager: {
+        type: Object,
+        value: Polymer.IronOverlayManager
+      }
+
+    },
+
+    /**
+     * Appends the backdrop to document body and sets its `z-index` to be below the latest overlay.
+     */
+    prepare: function() {
+      if (!this.parentNode) {
+        Polymer.dom(document.body).appendChild(this);
+        this.style.zIndex = this._manager.currentOverlayZ() - 1;
+      }
+    },
+
+    /**
+     * Shows the backdrop if needed.
+     */
+    open: function() {
+      // only need to make the backdrop visible if this is called by the first overlay with a backdrop
+      if (this._manager.getBackdrops().length < 2) {
+        this._setOpened(true);
+      }
+    },
+
+    /**
+     * Hides the backdrop if needed.
+     */
+    close: function() {
+      // only need to make the backdrop invisible if this is called by the last overlay with a backdrop
+      if (this._manager.getBackdrops().length < 2) {
+        this._setOpened(false);
+      }
+    },
+
+    /**
+     * Removes the backdrop from document body if needed.
+     */
+    complete: function() {
+      // only remove the backdrop if there are no more overlays with backdrops
+      if (this._manager.getBackdrops().length === 0 && this.parentNode) {
+        Polymer.dom(this.parentNode).removeChild(this);
+      }
+    }
+
+  });
+
+})();
+