[fsp] Add an option for mounting in R/W mode.

chrome/browser/chromeos/file_system_provider/provided_file_system_info.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h b/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
index 1ccd9e0c75f21b8639f4c11c48359f0e8844b7ba..60b80fd027df3ef6fa67a52cc65cc12f17e70fc2 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system_info.h
@@ -19,6 +19,7 @@ class ProvidedFileSystemInfo {
   ProvidedFileSystemInfo(const std::string& extension_id,
                          const std::string& file_system_id,
                          const std::string& display_name,
+                         const bool writable,
                          const base::FilePath& mount_path);
 
   ~ProvidedFileSystemInfo();
@@ -26,6 +27,7 @@ class ProvidedFileSystemInfo {
   const std::string& extension_id() const { return extension_id_; }
   const std::string& file_system_id() const { return file_system_id_; }
   const std::string& display_name() const { return display_name_; }
+  bool writable() const { return writable_; }
   const base::FilePath& mount_path() const { return mount_path_; }
 
  private:
@@ -38,6 +40,9 @@ class ProvidedFileSystemInfo {
   // Name of the file system, can be rendered in the UI.
   std::string display_name_;
 
+  // Whether the file system is writable or just read-only.
+  bool writable_;
+
   // Mount path of the underlying file system.
   base::FilePath mount_path_;
 };