Mojo: Add String, Float, and Double types to codec.js.

mojo/bindings/js/codec_unittests.js

Index: mojo/bindings/js/codec_unittests.js
diff --git a/mojo/bindings/js/codec_unittests.js b/mojo/bindings/js/codec_unittests.js
index b20dbcb47a37032fb974812065017d448eb260ce..09e5351a7af1fbf2dc376e0fdcc270a9a6f1e6df 100644
--- a/mojo/bindings/js/codec_unittests.js
+++ b/mojo/bindings/js/codec_unittests.js
@@ -9,6 +9,7 @@ define([
   ], function(expect, codec, sample) {
   testBar();
   testFoo();
+  testTypes();
   testAlign();
   testUtf8();
   this.result = "PASS";
@@ -133,6 +134,34 @@ define([
     expect(foo2.source).toEqual(foo.source);
   }
 
+  function testTypes() {
+    function encodeDecode(cls, input, expectedResult, encodedSize) {
+      var messageName = 42;
+      var payloadSize = encodedSize || cls.encodedSize;
+
+      var builder = new codec.MessageBuilder(messageName, payloadSize);
+      builder.encodeStruct(cls, input)
+      var message = builder.finish();
+
+      var reader = new codec.MessageReader(message);
+      expect(reader.payloadSize).toBe(payloadSize);
+      expect(reader.messageName).toBe(messageName);
+      var result = reader.decodeStruct(cls);
+      expect(result).toEqual(expectedResult);
+    }
+    encodeDecode(codec.String, "banana", "banana", 24);
+    encodeDecode(codec.Int8, -1, -1);
+    encodeDecode(codec.Int8, 0xff, -1);
+    encodeDecode(codec.Int16, -1, -1);
+    encodeDecode(codec.Int16, 0xff, 0xff);
+    encodeDecode(codec.Int16, 0xffff, -1);
+    encodeDecode(codec.Int32, -1, -1);
+    encodeDecode(codec.Int32, 0xffff, 0xffff);
+    encodeDecode(codec.Int32, 0xffffffff, -1);
+    encodeDecode(codec.Float, 1.0, 1.0);
+    encodeDecode(codec.Double, 1.0, 1.0);
+  }
+
   function testAlign() {
     var aligned = [
       0, // 0