Show an InfoBar when trying to start Packaged Apps from Metro mode.

chrome/browser/extensions/platform_app_launcher.cc

Index: chrome/browser/extensions/platform_app_launcher.cc
diff --git a/chrome/browser/extensions/platform_app_launcher.cc b/chrome/browser/extensions/platform_app_launcher.cc
index 0d376098286f04c772a77002469e11c72bc0e94a..74f25512f8acb4ed2aa3c970adc35f700c7baac9 100644
--- a/chrome/browser/extensions/platform_app_launcher.cc
+++ b/chrome/browser/extensions/platform_app_launcher.cc
@@ -21,6 +21,7 @@
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/lazy_background_task_queue.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/extensions/app_metro_infobar_delegate_win.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "content/public/browser/browser_thread.h"
@@ -32,6 +33,10 @@
 #include "webkit/fileapi/file_system_types.h"
 #include "webkit/fileapi/isolated_context.h"
 
+#if defined(OS_WIN)
+#include "win8/util/win8_util.h"
+#endif
+
 using content::BrowserThread;
 using extensions::app_file_handler_util::FileHandlerForId;
 using extensions::app_file_handler_util::FileHandlerCanHandleFileWithMimeType;
@@ -315,6 +320,16 @@ void LaunchPlatformApp(Profile* profile,
                        const Extension* extension,
                        const CommandLine* command_line,
                        const base::FilePath& current_directory) {
+#if defined(OS_WIN)
+  // On Windows 8's single window Metro mode we can not launch platform apps.
+  // Offer to switch Chrome to desktop mode.
+  if (win8::IsSingleWindowMetroMode()) {
+    chrome::AppMetroInfoBarDelegateWin::CreateAndActivateMetroForApp(
+        profile, extension->id());
+    return;
+  }
+#endif
+
   base::FilePath path;
   if (!GetAbsolutePathFromCommandLine(command_line, current_directory, &path)) {
     LaunchPlatformAppWithNoData(profile, extension);