Updating Element.scrollIntoView to be platform independent.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 066b61e898bc065d122296463caa4fd7572edead..b957969d6107824495190770ef13c5b903551953 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -8961,6 +8961,47 @@ abstract class Element extends Node implements ElementTraversal native "*Element
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
   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;
+    scrollIntoViewIfNeeded = JS('bool', '!!(#.scrollIntoViewIfNeeded)', this);
+    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();
+    }
+  }
+
   @DomName('Element.mouseWheelEvent')
   static const EventStreamProvider<WheelEvent> mouseWheelEvent =
       const _CustomEventStreamProvider<WheelEvent>(
@@ -9566,10 +9607,15 @@ abstract class Element extends Node implements ElementTraversal native "*Element
   @DocsEditable
   void scrollByPages(int pages) native;
 
+  @JSName('scrollIntoView')
+  @DomName('Element.scrollIntoView')
+  @DocsEditable
+  void $dom_scrollIntoView([bool alignWithTop]) native;
+
   @JSName('scrollIntoViewIfNeeded')
   @DomName('Element.scrollIntoViewIfNeeded')
   @DocsEditable
-  void scrollIntoView([bool centerIfNeeded]) native;
+  void $dom_scrollIntoViewIfNeeded([bool centerIfNeeded]) native;
 
   @JSName('setAttribute')
   @DomName('Element.setAttribute')