(2nd try) Add a helper class that keeps per-profile information for FileSystem API

chrome/browser/file_system/file_system_dispatcher_host.cc

Index: chrome/browser/file_system/file_system_dispatcher_host.cc
diff --git a/chrome/browser/file_system/file_system_dispatcher_host.cc b/chrome/browser/file_system/file_system_dispatcher_host.cc
index 3e23695a5a052eca7d05fac2adce1a3cc5806277..d8768081fdae5e61355afc5a06829c39a6990e7e 100644
--- a/chrome/browser/file_system/file_system_dispatcher_host.cc
+++ b/chrome/browser/file_system/file_system_dispatcher_host.cc
@@ -8,19 +8,23 @@
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/file_system/file_system_host_context.h"
 #include "chrome/browser/host_content_settings_map.h"
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/render_messages_params.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebFileError.h"
+#include "webkit/glue/webkit_glue.h"
 
 FileSystemDispatcherHost::FileSystemDispatcherHost(
     IPC::Message::Sender* sender,
+    FileSystemHostContext* file_system_host_context,
     HostContentSettingsMap* host_content_settings_map)
     : message_sender_(sender),
       process_handle_(0),
       shutdown_(false),
+      context_(file_system_host_context),
       host_content_settings_map_(host_content_settings_map) {
   DCHECK(message_sender_);
 }
@@ -54,20 +58,46 @@ bool FileSystemDispatcherHost::OnMessageReceived(
 
 void FileSystemDispatcherHost::OnOpenFileSystem(
     const ViewHostMsg_OpenFileSystemRequest_Params& params) {
-  string16 name;
-  string16 root_path;
 
-  // TODO(kinuko): not implemented yet.
+  // TODO(kinuko): hook up ContentSettings cookies type checks.
+
+  FilePath root_path;
+  std::string name;
+
+  if (!context_->GetFileSystemRootPath(params.origin_url,
+                                       params.type,
+                                       &root_path,
+                                       &name)) {
+    Send(new ViewMsg_OpenFileSystemRequest_Complete(
+        params.routing_id,
+        params.request_id,
+        false,
+        string16(),
+        string16()));
+    return;
+  }
+
+  // TODO(kinuko): creates the root directory and if it succeeds.
 
   Send(new ViewMsg_OpenFileSystemRequest_Complete(
       params.routing_id,
       params.request_id,
-      false,
-      name, root_path));
+      true,
+      UTF8ToUTF16(name),
+      webkit_glue::FilePathToWebString(root_path)));
 }
 
 void FileSystemDispatcherHost::OnMove(
     int request_id, const string16& src_path, const string16& dest_path) {
+  if (!context_->CheckValidFileSystemPath(
+          webkit_glue::WebStringToFilePath(src_path)) ||
+      !context_->CheckValidFileSystemPath(
+          webkit_glue::WebStringToFilePath(dest_path))) {
+    Send(new ViewMsg_FileSystem_Failed(
+        request_id, WebKit::WebFileErrorSecurity));
+    return;
+  }
+
   // TODO(kinuko): not implemented yet.
 
   Send(new ViewMsg_FileSystem_Failed(