[Media Galleries] Lazily initialize the storage monitor.

chrome/browser/ui/webui/options/media_galleries_handler.cc

Index: chrome/browser/ui/webui/options/media_galleries_handler.cc
diff --git a/chrome/browser/ui/webui/options/media_galleries_handler.cc b/chrome/browser/ui/webui/options/media_galleries_handler.cc
index de76e34b104df31ee4274c9028fc6e1f518231ce..5998e1d8d7765e7e46ea7a055d6c65ec798500ab 100644
--- a/chrome/browser/ui/webui/options/media_galleries_handler.cc
+++ b/chrome/browser/ui/webui/options/media_galleries_handler.cc
@@ -11,6 +11,7 @@
 #include "chrome/browser/media_galleries/media_file_system_registry.h"
 #include "chrome/browser/media_galleries/media_galleries_preferences.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/storage_monitor/storage_monitor.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
@@ -26,7 +27,8 @@ using chrome::MediaGalleriesPreferences;
 using chrome::MediaGalleriesPrefInfoMap;
 using chrome::MediaGalleryPrefInfo;
 
-MediaGalleriesHandler::MediaGalleriesHandler() {
+MediaGalleriesHandler::MediaGalleriesHandler()
+    : weak_ptr_factory_(this) {
 }
 
 MediaGalleriesHandler::~MediaGalleriesHandler() {
@@ -61,6 +63,10 @@ void MediaGalleriesHandler::InitializePage() {
                    base::Unretained(this)));
   }
 
+  // Note: this call will set up the StorageMonitor.
+  // That is needed not only to populate the initial page contents,
+  // but also to hook the preferences up to device notifications so
+  // the change listener receives events.
   OnGalleriesChanged();
 }
 
@@ -76,6 +82,12 @@ void MediaGalleriesHandler::RegisterMessages() {
 }
 
 void MediaGalleriesHandler::OnGalleriesChanged() {
+  chrome::StorageMonitor::GetInstance()->Initialize(
+      base::Bind(&MediaGalleriesHandler::OnStorageMonitorInitialized,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void MediaGalleriesHandler::OnStorageMonitorInitialized() {
   Profile* profile = Profile::FromWebUI(web_ui());
   chrome::MediaGalleriesPreferences* preferences =
       g_browser_process->media_file_system_registry()->GetPreferences(profile);
@@ -123,19 +135,19 @@ void MediaGalleriesHandler::HandleForgetGallery(const base::ListValue* args) {
     return;
   }
 
-  chrome::MediaGalleriesPreferences* prefs =
+  chrome::MediaGalleriesPreferences* preferences =
       g_browser_process->media_file_system_registry()->GetPreferences(
           Profile::FromWebUI(web_ui()));
-  prefs->ForgetGalleryById(id);
+  preferences->ForgetGalleryById(id);
 }
 
 void MediaGalleriesHandler::FileSelected(const base::FilePath& path,
                                          int index,
                                          void* params) {
-  chrome::MediaGalleriesPreferences* prefs =
+  chrome::MediaGalleriesPreferences* preferences =
       g_browser_process->media_file_system_registry()->GetPreferences(
           Profile::FromWebUI(web_ui()));
-  prefs->AddGalleryByPath(path);
+  preferences->AddGalleryByPath(path);
 }
 
 }  // namespace options