Added TodoMVC startup benchmarks.

samples/third_party/todomvc_performance/js_todomvc/elements/td-input.html

Index: samples/third_party/todomvc_performance/js_todomvc/elements/td-input.html
diff --git a/samples/third_party/todomvc_performance/js_todomvc/elements/td-input.html b/samples/third_party/todomvc_performance/js_todomvc/elements/td-input.html
new file mode 100755
index 0000000000000000000000000000000000000000..5679be12eaeb973a7535b1cfecf37110131dc82b
--- /dev/null
+++ b/samples/third_party/todomvc_performance/js_todomvc/elements/td-input.html
@@ -0,0 +1,24 @@
+<link rel="import" href="../components/polymer/polymer.html">
+
+<polymer-element name="td-input" extends="input" on-keyup="{{keyupAction}}" on-keypress="{{keypressAction}}">
+	<script>
+		(function() {
+			var ENTER_KEY = 13;
+			var ESC_KEY = 27;
+			Polymer('td-input', {
+				keypressAction: function(e, detail, sender) {
+					// Listen for enter on keypress but esc on keyup, because
+					// IE doesn't fire keyup for enter.
+					if (e.keyCode === ENTER_KEY) {
+						this.fire('td-input-commit');
+					}
+				},
+				keyupAction: function(e, detail, sender) {
+					if (e.keyCode === ESC_KEY) {
+						this.fire('td-input-cancel');
+					}
+				}
+			});
+		})();
+	</script>
+</polymer-element>