Revert "Revert "Converting dart:html to use DateTime rather than Date.""

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 4059b2c6cde574f1e65b70d8d34d435694f39560..5bb71d2c2ebab4f9301c85eaad44f9120fcf9f9b 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -6601,7 +6601,7 @@ class DataView extends ArrayBufferView {
 
   @DomName('DataView.getInt8')
   @DocsEditable
-  int getInt8(int byteOffset) native "DataView_getInt8_Callback";
+  Object getInt8({int byteOffset}) native "DataView_getInt8_Callback";
 
   int getUint16(int byteOffset, {bool littleEndian}) {
     if (?littleEndian) {
@@ -6635,7 +6635,7 @@ class DataView extends ArrayBufferView {
 
   @DomName('DataView.getUint8')
   @DocsEditable
-  int getUint8(int byteOffset) native "DataView_getUint8_Callback";
+  Object getUint8({int byteOffset}) native "DataView_getUint8_Callback";
 
   void setFloat32(int byteOffset, num value, {bool littleEndian}) {
     if (?littleEndian) {
@@ -11118,7 +11118,7 @@ class File extends Blob {
 
   @DomName('File.lastModifiedDate')
   @DocsEditable
-  Date get lastModifiedDate native "File_lastModifiedDate_Getter";
+  DateTime get lastModifiedDate native "File_lastModifiedDate_Getter";
 
   @DomName('File.name')
   @DocsEditable
@@ -13258,17 +13258,6 @@ class HtmlDocument extends Document {
     document.$dom_body = value;
   }
 
-  /**
-   * Registers a custom Element subclass as an available HTML tag.
-   *
-   * Not yet implemented.
-   */
-  @Experimental
-  void register(String tagName, Type elementClass) {
-    // TODO: tagName validation
-    throw new Exception('Not yet implemented');
-  }
-
   @DomName('Document.caretRangeFromPoint')
   Range caretRangeFromPoint(int x, int y) {
     return document.$dom_caretRangeFromPoint(x, y);
@@ -14636,11 +14625,11 @@ class InputElement extends _Element_Merged implements
 
   @DomName('HTMLInputElement.valueAsDate')
   @DocsEditable
-  Date get valueAsDate native "HTMLInputElement_valueAsDate_Getter";
+  DateTime get valueAsDate native "HTMLInputElement_valueAsDate_Getter";
 
   @DomName('HTMLInputElement.valueAsDate')
   @DocsEditable
-  void set valueAsDate(Date value) native "HTMLInputElement_valueAsDate_Setter";
+  void set valueAsDate(DateTime value) native "HTMLInputElement_valueAsDate_Setter";
 
   @DomName('HTMLInputElement.valueAsNumber')
   @DocsEditable
@@ -17939,7 +17928,7 @@ class Metadata extends NativeFieldWrapperClass1 {
 
   @DomName('Metadata.modificationTime')
   @DocsEditable
-  Date get modificationTime native "Metadata_modificationTime_Getter";
+  DateTime get modificationTime native "Metadata_modificationTime_Getter";
 
   @DomName('Metadata.size')
   @DocsEditable
@@ -21023,7 +21012,7 @@ class RtcStatsElement extends NativeFieldWrapperClass1 {
 
   @DomName('RTCStatsElement.timestamp')
   @DocsEditable
-  Date get timestamp native "RTCStatsElement_timestamp_Getter";
+  DateTime get timestamp native "RTCStatsElement_timestamp_Getter";
 
   @DomName('RTCStatsElement.names')
   @DocsEditable