Add IPC plumbing code for FileSystem API's openFileSystem

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
new file mode 100644
index 0000000000000000000000000000000000000000..496a623cf07dd0cad65340f4649f49225a0bd05a
--- /dev/null
+++ b/chrome/browser/file_system/file_system_dispatcher_host.cc
@@ -0,0 +1,81 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/file_system/file_system_dispatcher_host.h"
+
+#include "base/thread.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_thread.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 "googleurl/src/gurl.h"
+
+FileSystemDispatcherHost::FileSystemDispatcherHost(
+    IPC::Message::Sender* sender,
+    HostContentSettingsMap* host_content_settings_map)
+    : message_sender_(sender),
+      process_handle_(0),
+      shutdown_(false),
+      host_content_settings_map_(host_content_settings_map) {
+  DCHECK(message_sender_);
+}
+
+void FileSystemDispatcherHost::Init(base::ProcessHandle process_handle) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+  DCHECK(!shutdown_);
+  DCHECK(!process_handle_);
+  DCHECK(process_handle);
+  process_handle_ = process_handle;
+}
+
+void FileSystemDispatcherHost::Shutdown() {
+  message_sender_ = NULL;
+  shutdown_ = true;
+}
+
+bool FileSystemDispatcherHost::OnMessageReceived(
+    const IPC::Message& message, bool* message_was_ok) {
+  DCHECK(!shutdown_);
+  *message_was_ok = true;
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(FileSystemDispatcherHost, message, *message_was_ok)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_OpenFileSystemRequest, OnOpenFileSystem)
+    // TODO(kinuko): add more.
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+  return handled;
+}
+
+void FileSystemDispatcherHost::OnOpenFileSystem(
+    const ViewHostMsg_OpenFileSystemRequest_Params& params) {
+  string16 name;
+  string16 root_path;
+
+  // TODO(kinuko): not implemented yet.
+
+  Send(new ViewMsg_OpenFileSystemRequest_Complete(
+    params.routing_id,
+    params.request_id,
+    false,
+    name, root_path));
+}
+
+void FileSystemDispatcherHost::Send(IPC::Message* message) {
+  if (!ChromeThread::CurrentlyOn(ChromeThread::IO)) {
+    if (!ChromeThread::PostTask(
+            ChromeThread::IO, FROM_HERE,
+            NewRunnableMethod(this,
+                              &FileSystemDispatcherHost::Send,
+                              message)))
+      delete message;
+    return;
+  }
+
+  if (!shutdown_ && message_sender_)
+    message_sender_->Send(message);
+  else
+    delete message;
+}