Add a flag to enable open in window for hosted apps on Mac.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index c239d4f363d9f18d36a4417ceb3deb828c69727f..2c68318630b2794e632537e35fd6ae8193eae685 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1485,6 +1485,12 @@ const Experiment kExperiments[] = {
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNewBookmarkApps,
                                switches::kDisableNewBookmarkApps)},
 #if defined(OS_MACOSX)
+    {"disable-hosted-apps-in-windows",
+     IDS_FLAGS_HOSTED_APPS_IN_WINDOWS_NAME,
+     IDS_FLAGS_HOSTED_APPS_IN_WINDOWS_DESCRIPTION,
+     kOsMac,
+     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableHostedAppsInWindows,
+                               switches::kDisableHostedAppsInWindows)},
     {"disable-hosted-app-shim-creation",
      IDS_FLAGS_DISABLE_HOSTED_APP_SHIM_CREATION_NAME,
      IDS_FLAGS_DISABLE_HOSTED_APP_SHIM_CREATION_DESCRIPTION,