Launch panels as popup windows in Aura, and add separate launcher icon logic for panels.

chrome/browser/extensions/extension_tab_helper.h

Index: chrome/browser/extensions/extension_tab_helper.h
diff --git a/chrome/browser/extensions/extension_tab_helper.h b/chrome/browser/extensions/extension_tab_helper.h
index dd1edc8a009cbd7d9d2ef19a47202e82c1ec35fd..4d2f47eddaa38fbf8ba348eea9421803e752bc41 100644
--- a/chrome/browser/extensions/extension_tab_helper.h
+++ b/chrome/browser/extensions/extension_tab_helper.h
@@ -66,6 +66,9 @@ class ExtensionTabHelper
   // specified id.
   void SetExtensionAppById(const std::string& extension_app_id);
 
+  // Set just the app icon, used by panels created by an extension.
+  void SetExtensionAppIconById(const std::string& extension_app_id);
+
   const Extension* extension_app() const { return extension_app_; }
   bool is_app() const { return extension_app_ != NULL; }
   const WebApplicationInfo& web_app_info() const {
@@ -121,6 +124,8 @@ class ExtensionTabHelper
   // ImageLoadingTracker to load the extension's image.
   void UpdateExtensionAppIcon(const Extension* extension);
 
+  const Extension* GetExtension(const std::string& extension_app_id);
+
   // ImageLoadingTracker::Observer.
   virtual void OnImageLoaded(const gfx::Image& image,
                              const std::string& extension_id,