perf(view): inline and refactor view instantiation and hydration

- Don’t convert DOM array into JS array via `Array.slice`
- Inline static methods for instantiation and hydration
- Misc cleanup

Closes #291

modules/facade/src/collection.dart

@@ -32,6 +32,7 @@ class IterableMap extends IterableBase<List> {
 
 class MapWrapper {
   static HashMap create() => new HashMap();
+  static HashMap clone(Map m) => new HashMap.from(m);
   static HashMap createFromStringMap(m) => m;
   static HashMap createFromPairs(List pairs) {
     return pairs.fold({}, (m, p){

modules/facade/src/collection.es6

@@ -6,6 +6,7 @@ export var Set = window.Set;
 
 export class MapWrapper {
   static create():Map { return new Map(); }
+  static clone(m:Map):Map { return new Map(m); }
   static createFromStringMap(stringMap):Map {
     var result = MapWrapper.create();
     for (var prop in stringMap) {
@@ -63,8 +64,8 @@ export class ListWrapper {
   static createFixedSize(size):List { return new List(size); }
   static get(m, k) { return m[k]; }
   static set(m, k, v) { m[k] = v; }
-  static clone(array) {
-    return Array.prototype.slice.call(array, 0);
+  static clone(array:List) {
+    return array.slice(0);
   }
   static map(array, fn) {
     return array.map(fn);

modules/facade/src/dom.dart

@@ -68,11 +68,8 @@ class DOM {
   static clone(Node node) {
     return node.clone(true);
   }
-  static setProperty(Element element, String name, value) {
-    new JsObject.fromBrowserObject(element)[name] = value;
-  }
-  static getProperty(Element element, String name) {
-    return new JsObject.fromBrowserObject(element)[name];
+  static hasProperty(Element element, String name) {
+    return new JsObject.fromBrowserObject(element).hasProperty(name);
   }
   static getElementsByClassName(Element element, String name) {
     return element.getElementsByClassName(name);

modules/facade/src/dom.es6

@@ -63,11 +63,8 @@ export class DOM {
   static clone(node:Node) {
     return node.cloneNode(true);
   }
-  static setProperty(element:Element, name:string, value) {
-    element[name] = value;
-  }
-  static getProperty(element:Element, name:string) {
-    return element[name];
+  static hasProperty(element:Element, name:string) {
+    return name in element;
   }
   static getElementsByClassName(element:Element, name:string) {
     return element.getElementsByClassName(name);