MD Settings: Fix iron-list losing focus when items change.

third_party/polymer/v1_0/chromium.patch

Index: third_party/polymer/v1_0/chromium.patch
diff --git a/third_party/polymer/v1_0/chromium.patch b/third_party/polymer/v1_0/chromium.patch
index add37bdc75bed4c7759ca6e09d60f18071f47bc3..f64b85dd037274ac74d8a3774526f92952b24096 100644
--- a/third_party/polymer/v1_0/chromium.patch
+++ b/third_party/polymer/v1_0/chromium.patch
@@ -25,13 +25,76 @@ index 78a2a9ec621c..8b776dd790ea 100644
 
      _ariaDescribedByChanged: function(ariaDescribedBy) {
 diff --git a/components-chromium/iron-list/iron-list-extracted.js b/components-chromium/iron-list/iron-list-extracted.js
-index c9e0a9fd5330..5d04e7e9db8c 100644
+index c9e0a9fd5330..bb2f6aad64e8 100644
 --- a/components-chromium/iron-list/iron-list-extracted.js
 +++ b/components-chromium/iron-list/iron-list-extracted.js
-@@ -1466,6 +1466,10 @@
+@@ -126,6 +126,14 @@
+       scrollOffset: {
+         type: Number,
+         value: 0
++      },
++
++      /**
++       * If set to true, focus on an element will be preserved after rerender.
++       */
++      preserveFocus: {
++        type: Boolean,
++        value: false
+       }
+     },
+ 
+@@ -895,6 +903,15 @@
+      * to `items`, splices or updates to a single item.
+      */
+     _itemsChanged: function(change) {
++      var rendering = /^items(\.splices){0,1}$/.test(change.path);
++      var lastFocusedIndex, focusedElement;
++      if (rendering && this.preserveFocus) {
++        lastFocusedIndex = this._focusedIndex;
++        focusedElement = this.querySelector('* /deep/ *:focus');
++      }
++
++      var preservingFocus = rendering && this.preserveFocus && focusedElement;
++
+       if (change.path === 'items') {
+         this._virtualStart = 0;
+         this._physicalTop = 0;
+@@ -907,12 +924,11 @@
+         this._physicalItems = this._physicalItems || [];
+         this._physicalSizes = this._physicalSizes || [];
+         this._physicalStart = 0;
+-        if (this._scrollTop > this._scrollOffset) {
++        if (this._scrollTop > this._scrollOffset && !preservingFocus) {
+           this._resetScrollPosition(0);
+         }
+         this._removeFocusedItem();
+         this._debounceTemplate(this._render);
+-
+       } else if (change.path === 'items.splices') {
+         this._adjustVirtualIndex(change.value.indexSplices);
+         this._virtualCount = this.items ? this.items.length : 0;
+@@ -921,6 +937,17 @@
+       } else {
+         this._forwardItemPath(change.path.split('.').slice(1).join('.'), change.value);
+       }
++
++      // If the list was in focus when updated, preserve the focus on item.
++      if (preservingFocus) {
++        Polymer.dom.flush();
++        focusedElement.blur(); // paper- elements breaks when focused twice.
++        this._focusPhysicalItem(
++            Math.min(this.items.length - 1, lastFocusedIndex));
++        if (!this._isIndexVisible(this._focusedIndex)) {
++          this.scrollToIndex(this._focusedIndex);
++        }
++      }
+     },
+ 
+     /**
+@@ -1466,6 +1493,10 @@
        return this._physicalIndexForKey[this._collection.getKey(this._getNormalizedItem(idx))];
      },
-
+ 
 +    focusItem: function(idx) {
 +      this._focusPhysicalItem(idx);
 +    },