Add platform_app flag to manifest.

chrome/browser/about_flags.cc

 // Copyright (c) 2011 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/about_flags.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 425 matching lines @@
     SINGLE_VALUE_TYPE(switches::kEnablePhotoEditor)
   },
 #endif
   {
     "enable-media-source",
     IDS_FLAGS_ENABLE_MEDIA_SOURCE_NAME,
     IDS_FLAGS_ENABLE_MEDIA_SOURCE_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableMediaSource)
   },
+  {

[Aaron Boodman, 2011/11/04 05:45:16]

Keep in mind that once you put something in about:flags, users will start
clicking it and filing bugs. This happened to Tessa's recent work on lazy
background pages.

It seems like this isn't to the level yet where that would be useful, so I
recommend skipping about:flags for now, and just having the command-line flag.

+    "platform-apps",
+    IDS_FLAGS_ENABLE_PLATFORM_APPS_NAME,
+    IDS_FLAGS_ENABLE_PLATFORM_APPS_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(switches::kEnablePlatformApps)
+  },
 };
 
 const Experiment* experiments = kExperiments;
 size_t num_experiments = arraysize(kExperiments);
 
 // Stores and encapsulates the little state that about:flags has.
 class FlagsState {
  public:
   FlagsState() : needs_restart_(false) {}
   void ConvertFlagsToSwitches(PrefService* prefs, CommandLine* command_line);
@@ skipping 409 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags