Updating Element.scrollIntoView to be platform independent.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index fb6a963c1f3db8bbcd9fd94d2abc0c7b6fcc30a2..c5cc6d3f001de62f822403e8205e2f969eb9addf 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -9721,6 +9721,46 @@ abstract class Element extends Node implements ElementTraversal {
    */
   var xtag;
 
+  /**
+   * Scrolls this element into view.
+   *
+   * Only one of of the alignment options may be specified at a time.
+   *
+   * If no options are specified then this will attempt to scroll the minimum
+   * amount needed to bring the element into view.
+   *
+   * Note that alignCenter is currently only supported on WebKit platforms. If
+   * alignCenter is specified but not supported then this will fall back to
+   * alignTop.
+   *
+   * See also:
+   *
+   * * [scrollIntoView](http://docs.webplatform.org/wiki/dom/methods/scrollIntoView)
+   * * [scrollIntoViewIfNeeded](http://docs.webplatform.org/wiki/dom/methods/scrollIntoViewIfNeeded)
+   */
+  void scrollIntoView({bool alignCenter, bool alignTop, bool alignBottom}) {
+    var paramCount = (alignCenter != null ? 1 : 0) +
+        (alignTop != null ? 1 : 0) + (alignBottom != null ? 1 : 0);
+    if (paramCount > 1) {
+      throw new ArgumentError(
+          'Can only specify one of alignCenter, alignTop, alignBottom');
+    }
+    var scrollIntoViewIfNeeded = false;
+    if (alignTop != null) {
+      this.$dom_scrollIntoView(alignTop);
+    } else if (alignBottom != null) {
+      this.$dom_scrollIntoView(alignBottom);
+    } else if (scrollIntoViewIfNeeded) {
+      if (alignCenter != null) {
+        this.$dom_scrollIntoViewIfNeeded(alignCenter);
+      } else {
+        this.$dom_scrollIntoViewIfNeeded();
+      }
+    } else {
+      this.$dom_scrollIntoView();
+    }
+  }
+
 
   Element.internal() : super.internal();
 
@@ -10160,7 +10200,24 @@ abstract class Element extends Node implements ElementTraversal {
   @DocsEditable
   void scrollByPages(int pages) native "Element_scrollByPages_Callback";
 
-  void scrollIntoView([bool centerIfNeeded]) {
+  void $dom_scrollIntoView([bool alignWithTop]) {
+    if (?alignWithTop) {
+      _scrollIntoView_1(alignWithTop);
+      return;
+    }
+    _scrollIntoView_2();
+    return;
+  }
+
+  @DomName('Element._scrollIntoView_1')
+  @DocsEditable
+  void _scrollIntoView_1(alignWithTop) native "Element__scrollIntoView_1_Callback";
+
+  @DomName('Element._scrollIntoView_2')
+  @DocsEditable
+  void _scrollIntoView_2() native "Element__scrollIntoView_2_Callback";
+
+  void $dom_scrollIntoViewIfNeeded([bool centerIfNeeded]) {
     if (?centerIfNeeded) {
       _scrollIntoViewIfNeeded_1(centerIfNeeded);
       return;