Add PerAppSettingsService and use it to remember what desktop apps should create windows on.

chrome/browser/apps/per_app_settings_service.cc

Index: chrome/browser/apps/per_app_settings_service.cc
diff --git a/chrome/browser/apps/per_app_settings_service.cc b/chrome/browser/apps/per_app_settings_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cbff51958b322fdf176e350aa1bc319a78f03c33
--- /dev/null
+++ b/chrome/browser/apps/per_app_settings_service.cc
@@ -0,0 +1,29 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/apps/per_app_settings_service.h"
+
+PerAppSettingsService::PerAppSettingsService() {
+}
+
+PerAppSettingsService::~PerAppSettingsService() {
+}
+
+void PerAppSettingsService::SetDesktopLastLaunchedFrom(
+    const std::string& app_id, chrome::HostDesktopType host_desktop) {
+  default_desktops_[app_id] = host_desktop;
+}
+
+chrome::HostDesktopType PerAppSettingsService::GetDesktopLastLaunchedFrom(
+    const std::string& app_id) const {
+  DesktopMap::const_iterator it = default_desktops_.find(app_id);
+  if (it == default_desktops_.end())
+    NOTREACHED();
+  return it->second;
+}
+
+bool PerAppSettingsService::HasDesktopLastLaunchedFrom(
+    const std::string& app_id) const {
+  return default_desktops_.find(app_id) != default_desktops_.end();
+}