Change media galleries to external file system type to add toURL support

chrome/browser/media_galleries/fileapi/picasa_file_util.cc

Index: chrome/browser/media_galleries/fileapi/picasa_file_util.cc
diff --git a/chrome/browser/media_galleries/fileapi/picasa_file_util.cc b/chrome/browser/media_galleries/fileapi/picasa_file_util.cc
index 646f9548f4f80012cb1e4169554d97736c05e655..6b3ca1ff32d91fdefa7b8b2ed719297d43833d07 100644
--- a/chrome/browser/media_galleries/fileapi/picasa_file_util.cc
+++ b/chrome/browser/media_galleries/fileapi/picasa_file_util.cc
@@ -49,11 +49,24 @@ base::File::Error FindAlbumInfo(const std::string& key,
   return base::File::FILE_OK;
 }
 
-PicasaDataProvider::DataType GetDataTypeForURL(
+std::vector<std::string> GetVirtualPathComponents(
     const fileapi::FileSystemURL& url) {
-  std::vector<std::string> components;
-  fileapi::VirtualPath::GetComponentsUTF8Unsafe(url.path(), &components);
+  ImportedMediaGalleryRegistry* imported_registry =
+      ImportedMediaGalleryRegistry::GetInstance();
+  base::FilePath root = imported_registry->ImportedRoot().AppendASCII("picasa");
+
+  DCHECK(root.IsParent(url.path()) || root == url.path());
+  base::FilePath virtual_path;
+  root.AppendRelativePath(url.path(), &virtual_path);
+
+  std::vector<std::string> result;
+  fileapi::VirtualPath::GetComponentsUTF8Unsafe(virtual_path, &result);
+  return result;
+}
 
+PicasaDataProvider::DataType GetDataTypeForURL(
+    const fileapi::FileSystemURL& url) {
+  std::vector<std::string> components = GetVirtualPathComponents(url);
   if (components.size() >= 2 && components[0] == kPicasaDirAlbums)
     return PicasaDataProvider::ALBUMS_IMAGES_DATA;
 
@@ -107,8 +120,7 @@ base::File::Error PicasaFileUtil::GetFileInfoSync(
   if (platform_path)
     *platform_path = base::FilePath();
 
-  std::vector<std::string> components;
-  fileapi::VirtualPath::GetComponentsUTF8Unsafe(url.path(), &components);
+  std::vector<std::string> components = GetVirtualPathComponents(url);
 
   switch (components.size()) {
     case 0:
@@ -176,9 +188,7 @@ base::File::Error PicasaFileUtil::ReadDirectorySync(
   if (!file_info.is_directory)
     return base::File::FILE_ERROR_NOT_A_DIRECTORY;
 
-  std::vector<std::string> components;
-  fileapi::VirtualPath::GetComponentsUTF8Unsafe(url.path(), &components);
-
+  std::vector<std::string> components = GetVirtualPathComponents(url);
   switch (components.size()) {
     case 0: {
       // Root directory.
@@ -283,8 +293,7 @@ base::File::Error PicasaFileUtil::GetLocalFilePath(
     base::FilePath* local_file_path) {
   DCHECK(local_file_path);
   DCHECK(url.is_valid());
-  std::vector<std::string> components;
-  fileapi::VirtualPath::GetComponentsUTF8Unsafe(url.path(), &components);
+  std::vector<std::string> components = GetVirtualPathComponents(url);
 
   switch (components.size()) {
     case 2: