Add constructors for Float32Array and friends.

client/html/src/Float32ArrayWrappingImplementation.dart

Index: client/html/src/Float32ArrayWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_Float32ArrayWrappingImplementation.dart b/client/html/src/Float32ArrayWrappingImplementation.dart
similarity index 54%
rename from client/html/generated/src/wrapping/_Float32ArrayWrappingImplementation.dart
rename to client/html/src/Float32ArrayWrappingImplementation.dart
index d5d5c0dc9436661ae2de3fbec2b0f39a08a6c0db..f6b37fc7969d6609490974fb37640a33aa8df8bd 100644
--- a/client/html/generated/src/wrapping/_Float32ArrayWrappingImplementation.dart
+++ b/client/html/src/Float32ArrayWrappingImplementation.dart
@@ -2,11 +2,21 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// WARNING: Do not edit - generated code.
-
 class Float32ArrayWrappingImplementation extends ArrayBufferViewWrappingImplementation implements Float32Array {
   Float32ArrayWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
+  factory Float32ArrayWrappingImplementation(int length) =>
+    LevelDom.wrapFloat32Array(new dom.Float32Array(length));
+
+  factory Float32ArrayWrappingImplementation.from(List<num> list) =>
+    // TODO(nweiz): when there's a cross-platform name for the native
+    // implementation of List, check if [list] is native and if not convert it
+    // to a native list before sending it to the JS constructor.
+    LevelDom.wrapFloat32Array(new dom.Float32Array.fromList(list));
+
+  factory Float32ArrayWrappingImplementation.fromBuffer(ArrayBuffer buffer) =>
+    LevelDom.wrapFloat32Array(new dom.Float32Array.fromBuffer(LevelDom.unwrap(buffer)));
+
   int get length() { return _ptr.length; }
 
   Float32Array subarray(int start, [int end]) {