diff --git a/browser/api/atom_api_app.cc b/browser/api/atom_api_app.cc
index eece7af07644..9116e412142e 100644
--- a/browser/api/atom_api_app.cc
+++ b/browser/api/atom_api_app.cc
@@ -4,6 +4,7 @@
 
 #include "browser/api/atom_api_app.h"
 
+#include "base/command_line.h"
 #include "browser/browser.h"
 #include "vendor/node/src/node.h"
 
@@ -58,6 +59,38 @@ v8::Handle<v8::Value> App::Terminate(const v8::Arguments &args) {
   return v8::Undefined();
 }
 
+// static
+v8::Handle<v8::Value> App::AppendSwitch(const v8::Arguments &args) {
+  v8::HandleScope scope;
+
+  if (!args[0]->IsString())
+    return node::ThrowError("Bad argument");
+
+  std::string switch_string(*v8::String::Utf8Value(args[0]));
+  if (args.Length() == 1) {
+    CommandLine::ForCurrentProcess()->AppendSwitch(switch_string);
+  } else {
+    std::string value(*v8::String::Utf8Value(args[1]));
+    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+        switch_string, value);
+  }
+
+  return v8::Undefined();
+}
+
+// static
+v8::Handle<v8::Value> App::AppendArgument(const v8::Arguments &args) {
+  v8::HandleScope scope;
+
+  if (!args[0]->IsString())
+    return node::ThrowError("Bad argument");
+
+  std::string value(*v8::String::Utf8Value(args[0]));
+  CommandLine::ForCurrentProcess()->AppendArg(value);
+
+  return v8::Undefined();
+}
+
 // static
 void App::Initialize(v8::Handle<v8::Object> target) {
   v8::HandleScope scope;
@@ -70,6 +103,9 @@ void App::Initialize(v8::Handle<v8::Object> target) {
   NODE_SET_PROTOTYPE_METHOD(t, "terminate", Terminate);
 
   target->Set(v8::String::NewSymbol("Application"), t->GetFunction());
+
+  NODE_SET_METHOD(target, "appendSwitch", AppendSwitch);
+  NODE_SET_METHOD(target, "appendArgument", AppendArgument);
 }
 
 }  // namespace api
diff --git a/browser/api/atom_api_app.h b/browser/api/atom_api_app.h
index 06b650c9a070..cb33d0aa56d1 100644
--- a/browser/api/atom_api_app.h
+++ b/browser/api/atom_api_app.h
@@ -32,6 +32,8 @@ class App : public EventEmitter,
 
   static v8::Handle<v8::Value> Quit(const v8::Arguments &args);
   static v8::Handle<v8::Value> Terminate(const v8::Arguments &args);
+  static v8::Handle<v8::Value> AppendSwitch(const v8::Arguments &args);
+  static v8::Handle<v8::Value> AppendArgument(const v8::Arguments &args);
 
   DISALLOW_COPY_AND_ASSIGN(App);
 };
diff --git a/browser/api/lib/app.coffee b/browser/api/lib/app.coffee
index 3b699c4eacfc..3feb0d2bc2b7 100644
--- a/browser/api/lib/app.coffee
+++ b/browser/api/lib/app.coffee
@@ -1,7 +1,14 @@
+bindings = process.atomBinding 'app'
 EventEmitter = require('events').EventEmitter
 
-Application = process.atomBinding('app').Application
-Application.prototype.__proto__ = EventEmitter.prototype
+Application = bindings.Application
+Application::__proto__ = EventEmitter.prototype
+
+app = new Application
+
+app.commandLine =
+  appendSwitch: bindings.appendSwitch,
+  appendArgument: bindings.appendArgument
 
 # Only one App object pemitted.
-module.exports = new Application
+module.exports = app
diff --git a/browser/default_app/main.js b/browser/default_app/main.js
index 7076058f5037..bde619ed7f15 100644
--- a/browser/default_app/main.js
+++ b/browser/default_app/main.js
@@ -14,6 +14,8 @@ app.on('window-all-closed', function() {
 });
 
 delegate.browserMainParts.preMainMessageLoopRun = function() {
+  app.commandLine.appendSwitch('js-flags', '--harmony_collections');
+
   mainWindow = new BrowserWindow({ width: 800, height: 600 });
   mainWindow.loadUrl('file://' + __dirname + '/index.html');