[fsp] Add the getMetadata operation.

chrome/browser/chromeos/file_system_provider/mount_path_util.cc

Index: chrome/browser/chromeos/file_system_provider/mount_path_util.cc
diff --git a/chrome/browser/chromeos/file_system_provider/mount_path_util.cc b/chrome/browser/chromeos/file_system_provider/mount_path_util.cc
index ed7016d4223c922af0049e98349bc76cf1e42956..a7a351d233fb5e454994cb5807008e564bc19614 100644
--- a/chrome/browser/chromeos/file_system_provider/mount_path_util.cc
+++ b/chrome/browser/chromeos/file_system_provider/mount_path_util.cc
@@ -16,6 +16,9 @@
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
 
 namespace chromeos {
 namespace file_system_provider {
@@ -50,6 +53,8 @@ FileSystemURLParser::~FileSystemURLParser() {
 }
 
 bool FileSystemURLParser::Parse() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
   if (url_.type() != fileapi::kFileSystemTypeProvided)
     return false;
 
@@ -80,7 +85,7 @@ bool FileSystemURLParser::Parse() {
     std::vector<base::FilePath::StringType> components;
     url_.virtual_path().GetComponents(&components);
     DCHECK_LT(0u, components.size());
-    file_path_ = base::FilePath();
+    file_path_ = base::FilePath::FromUTF8Unsafe("/");
     for (size_t i = 1; i < components.size(); ++i) {
       // TODO(mtomasz): This could be optimized, to avoid unnecessary copies.
       file_path_ = file_path_.Append(components[i]);