[Media Galleries] Lazily initialize the storage monitor.

chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc

Index: chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
diff --git a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
index 64854f673fc46b4e64c02fc6088c66577768312a..b2ba2ddac10ac634920219e01685254e9f7a1d1c 100644
--- a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
+++ b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
@@ -60,29 +60,6 @@ void HandleProfileShutdownOnFileThread(void* profile_id) {
   GalleryWatchManager::OnProfileShutdown(profile_id);
 }
 
-// Gets the |gallery_file_path| and |gallery_pref_id| of the gallery specified
-// by the |gallery_id|. Returns true and set |gallery_file_path| and
-// |gallery_pref_id| if the |gallery_id| is valid and returns false otherwise.
-bool GetGalleryFilePathAndId(const std::string& gallery_id,
-                             Profile* profile,
-                             const Extension* extension,
-                             base::FilePath* gallery_file_path,
-                             chrome::MediaGalleryPrefId* gallery_pref_id) {
-  chrome::MediaGalleryPrefId pref_id;
-  if (!base::StringToUint64(gallery_id, &pref_id))
-    return false;
-  chrome::MediaFileSystemRegistry* registry =
-      g_browser_process->media_file_system_registry();
-   base::FilePath file_path(
-      registry->GetPreferences(profile)->LookUpGalleryPathForExtension(
-          pref_id, extension, false));
-  if (file_path.empty())
-    return false;
-  *gallery_pref_id = pref_id;
-  *gallery_file_path = file_path;
-  return true;
-}
-
 bool GetMediaGalleryPermissionFromDictionary(
     const DictionaryValue* dict,
     chrome::MediaGalleryPermission* out_permission) {
@@ -304,14 +281,37 @@ bool MediaGalleriesPrivateAddGalleryWatchFunction::RunImpl() {
   scoped_ptr<AddGalleryWatch::Params> params(
       AddGalleryWatch::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
-  base::FilePath gallery_file_path;
-  chrome::MediaGalleryPrefId gallery_pref_id = 0;
-  if (!GetGalleryFilePathAndId(params->gallery_id, profile_, GetExtension(),
-                               &gallery_file_path, &gallery_pref_id)) {
+
+  chrome::MediaGalleryPrefId pref_id = chrome::kInvalidMediaGalleryPrefId;
+  if (!base::StringToUint64(params->gallery_id, &pref_id) ||
+      pref_id == chrome::kInvalidMediaGalleryPrefId) {
     error_ = kInvalidGalleryIDError;
     return false;
   }
 
+  chrome::MediaFileSystemRegistry* registry =
+      g_browser_process->media_file_system_registry();
+  registry->GetPreferencesAsync(profile_,
+      base::Bind(&MediaGalleriesPrivateAddGalleryWatchFunction::OnPreferences,
+                 this, pref_id));
+  return true;
+}
+
+void MediaGalleriesPrivateAddGalleryWatchFunction::OnPreferences(
+    chrome::MediaGalleryPrefId pref_id,
+    chrome::MediaGalleriesPreferences* preferences) {
+  base::FilePath file_path(preferences->LookUpGalleryPathForExtension(
+      pref_id, GetExtension(), false));
+
+  if (file_path.empty()) {
+    HandleResponse(pref_id, false);
+    return;
+  }
+
+  GalleryWatchStateTracker* state_tracker =
+      MediaGalleriesPrivateAPI::Get(profile_)->GetGalleryWatchStateTracker();
+  state_tracker->SetPreferences(preferences);
+
 #if defined(OS_WIN)
   MediaGalleriesPrivateEventRouter* router =
       MediaGalleriesPrivateAPI::Get(profile_)->GetEventRouter();
@@ -321,19 +321,18 @@ bool MediaGalleriesPrivateAddGalleryWatchFunction::RunImpl() {
       FROM_HERE,
       base::Bind(&GalleryWatchManager::SetupGalleryWatch,
                  profile_,
-                 gallery_pref_id,
-                 gallery_file_path,
+                 pref_id,
+                 file_path,
                  extension_id(),
                  router->AsWeakPtr()),
       base::Bind(&MediaGalleriesPrivateAddGalleryWatchFunction::HandleResponse,
                  this,
-                 gallery_pref_id));
+                 pref_id));
 #else
   // Recursive gallery watch operation is not currently supported on
   // non-windows platforms. Please refer to crbug.com/144491 for more details.
-  HandleResponse(gallery_pref_id, false);
+  HandleResponse(pref_id, false);
 #endif
-  return true;
 }
 
 void MediaGalleriesPrivateAddGalleryWatchFunction::HandleResponse(
@@ -373,24 +372,47 @@ bool MediaGalleriesPrivateRemoveGalleryWatchFunction::RunImpl() {
       RemoveGalleryWatch::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
-  base::FilePath gallery_file_path;
-  chrome::MediaGalleryPrefId gallery_pref_id = 0;
-  if (!GetGalleryFilePathAndId(params->gallery_id, profile_, GetExtension(),
-                               &gallery_file_path, &gallery_pref_id)) {
+  chrome::MediaGalleryPrefId pref_id = chrome::kInvalidMediaGalleryPrefId;
+  if (!base::StringToUint64(params->gallery_id, &pref_id) ||
+      pref_id == chrome::kInvalidMediaGalleryPrefId) {
     error_ = kInvalidGalleryIDError;
     return false;
   }
 
+  chrome::MediaFileSystemRegistry* registry =
+      g_browser_process->media_file_system_registry();
+  registry->GetPreferencesAsync(profile_, base::Bind(
+      &MediaGalleriesPrivateRemoveGalleryWatchFunction::OnPreferences,
+      base::Unretained(this), pref_id));
+  return true;
+}
+
+void MediaGalleriesPrivateRemoveGalleryWatchFunction::OnPreferences(
+    chrome::MediaGalleriesPreferences* preferences,
+    chrome::MediaGalleryPrefId pref_id) {
+  base::FilePath file_path(preferences->LookUpGalleryPathForExtension(
+      pref_id, GetExtension(), false));
+
+  if (file_path.empty) {
+    HandleResponse(pref_id, false);
+    return;
+  }
+
+  GalleryWatchStateTracker* state_tracker =
+      MediaGalleriesPrivateAPI::Get(profile_)->GetGalleryWatchStateTracker();
+  state_tracker->SetPreferences(preferences);
+
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&GalleryWatchManager::RemoveGalleryWatch,
                  profile_,
-                 gallery_file_path,
+                 preferences,
+                 file_path,
                  extension_id()));
 
   GalleryWatchStateTracker* state_tracker =
       MediaGalleriesPrivateAPI::Get(profile_)->GetGalleryWatchStateTracker();
-  state_tracker->OnGalleryWatchRemoved(extension_id(), gallery_pref_id);
+  state_tracker->OnGalleryWatchRemoved(extension_id(), pref_id);
 #endif
   return true;
 }