Add dart2js unittest to analyze the API.

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 f512891617b9d62e5e4a61c8908223a0a98e3728..a1ea767add95eb6be0b3bbb73ef5602cb357ac11 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -7398,7 +7398,7 @@ class _FrozenElementList implements List {
     return new ListView<Element>(this, 0, n);
   }
 
-  Iterable<Element> takeWhile(bool test(T value)) {
+  Iterable<Element> takeWhile(bool test(value)) {
     return new TakeWhileIterable<Element>(this, test);
   }
 
@@ -7406,7 +7406,7 @@ class _FrozenElementList implements List {
     return new ListView<Element>(this, n, null);
   }
 
-  Iterable<Element> skipWhile(bool test(T value)) {
+  Iterable<Element> skipWhile(bool test(value)) {
     return new SkipWhileIterable<Element>(this, test);
   }
 
@@ -24834,9 +24834,9 @@ class KeyboardEventController {
 
 
 /**
- * Defines the keycode values for keys that are returned by 
+ * Defines the keycode values for keys that are returned by
  * KeyboardEvent.keyCode.
- * 
+ *
  * Important note: There is substantial divergence in how different browsers
  * handle keycodes and their variants in different locales/keyboard layouts. We
  * provide these constants to help make code processing keys more readable.
@@ -24844,7 +24844,7 @@ class KeyboardEventController {
 abstract class KeyCode {
   // These constant names were borrowed from Closure's Keycode enumeration
   // class.
-  // http://closure-library.googlecode.com/svn/docs/closure_goog_events_keycodes.js.source.html  
+  // http://closure-library.googlecode.com/svn/docs/closure_goog_events_keycodes.js.source.html
   static const int WIN_KEY_FF_LINUX = 0;
   static const int MAC_ENTER = 3;
   static const int BACKSPACE = 8;
@@ -25039,12 +25039,12 @@ abstract class KeyCode {
         (keyCode >= A && keyCode <= Z)) {
       return true;
     }
- 
+
     // Safari sends zero key code for non-latin characters.
     if (_Device.isWebKit && keyCode == 0) {
       return true;
     }
- 
+
     return (keyCode == SPACE || keyCode == QUESTION_MARK || keyCode == NUM_PLUS
         || keyCode == NUM_MINUS || keyCode == NUM_PERIOD ||
         keyCode == NUM_DIVISION || keyCode == SEMICOLON ||
@@ -26930,7 +26930,7 @@ class FixedSizeListIterator<T> implements Iterator<T> {
   final int _length;  // Cache array length for faster access.
   int _position;
   T _current;
-  
+
   FixedSizeListIterator(List<T> array)
       : _array = array,
         _position = -1,