Make platform apps use and require a different container ("shell" instead of "panel")

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index 169e97e7c34a592f94f29f92cc5d6c4ce5b80977..8c988f3fc8b7e11bd591e41dccdf8d92bfd15767 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -125,6 +125,7 @@ namespace extension_manifest_values {
   extern const char kIntentDispositionInline[];
   extern const char kIsolatedStorage[];
   extern const char kLaunchContainerPanel[];
+  extern const char kLaunchContainerShell[];
   extern const char kLaunchContainerTab[];
   extern const char kLaunchContainerWindow[];
   extern const char kPageActionTypePermanent[];
@@ -196,6 +197,7 @@ namespace extension_manifest_errors {
   extern const char kInvalidJsList[];
   extern const char kInvalidKey[];
   extern const char kInvalidLaunchContainer[];
+  extern const char kInvalidLaunchContainerForNonPlatform[];
   extern const char kInvalidLaunchContainerForPlatform[];
   extern const char kInvalidLaunchHeight[];
   extern const char kInvalidLaunchHeightContainer[];
@@ -350,7 +352,8 @@ namespace extension_misc {
   enum LaunchContainer {
     LAUNCH_WINDOW,
     LAUNCH_PANEL,
-    LAUNCH_TAB
+    LAUNCH_TAB,
+    LAUNCH_SHELL
   };
 
   // The name of the apps promo histogram.