mediaview: Mount ARC documents provider file system volumes.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.cc

Index: chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.cc
diff --git a/chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.cc b/chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.cc
index 8068a7f3d96d991b71c71c12ef21388c5cf251f3..249ebd5240158858448b72e1abeae906ef8f5cb1 100644
--- a/chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.cc
+++ b/chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.cc
@@ -19,6 +19,14 @@ const base::FilePath::CharType kDocumentsProviderMountPointPath[] =
     "/special/arc-documents-provider";
 const char kAndroidDirectoryMimeType[] = "vnd.android.document/directory";
 
+base::FilePath GetDocumentsProviderMountPath(
+    const std::string& authority,
+    const std::string& root_document_id) {
+  return base::FilePath(kDocumentsProviderMountPointPath)
+      .Append(authority)
+      .Append(root_document_id);
+}
+
 bool ParseDocumentsProviderUrl(const storage::FileSystemURL& url,
                                std::string* authority,
                                std::string* root_document_id,
@@ -42,9 +50,8 @@ bool ParseDocumentsProviderUrl(const storage::FileSystemURL& url,
   *authority = components[3];
   *root_document_id = components[4];
 
-  base::FilePath root_path = base::FilePath(kDocumentsProviderMountPointPath)
-                                 .Append(*authority)
-                                 .Append(*root_document_id);
+  base::FilePath root_path =
+      GetDocumentsProviderMountPath(*authority, *root_document_id);
   // Special case: AppendRelativePath() fails for identical paths.
   if (url_path_stripped == root_path) {
     path->clear();