Implement ManifestManager to handle manifest in content/

content/browser/manifest/manifest_manager_host.cc

Index: content/browser/manifest/manifest_manager_host.cc
diff --git a/content/browser/manifest/manifest_manager_host.cc b/content/browser/manifest/manifest_manager_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2e5fbda37b94c5c6c530a9bd52930eacf5ae8200
--- /dev/null
+++ b/content/browser/manifest/manifest_manager_host.cc
@@ -0,0 +1,54 @@
+// Copyright 2014 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 "content/browser/manifest/manifest_manager_host.h"
+
+#include "content/common/manifest_manager_messages.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/common/manifest.h"
+
+namespace content {
+
+ManifestManagerHost::ManifestManagerHost(WebContents* web_contents)
+  : WebContentsObserver(web_contents) {
+}
+
+ManifestManagerHost::~ManifestManagerHost() {
+}
+
+void ManifestManagerHost::GetManifest(RenderFrameHost* render_frame_host,
+                                      const GetManifestCallback& callback) {
+  int request_id = pending_callbacks_.Add(new GetManifestCallback(callback));
+
+  render_frame_host->Send(new ManifestManagerMsg_RequestManifest(
+      render_frame_host->GetRoutingID(), request_id));
+}
+
+bool ManifestManagerHost::OnMessageReceived(
+    const IPC::Message& message, RenderFrameHost* render_frame_host) {
+  bool handled = true;
+
+  IPC_BEGIN_MESSAGE_MAP(ManifestManagerHost, message)
+    IPC_MESSAGE_HANDLER(ManifestManagerHostMsg_RequestManifestResponse,
+                        OnRequestManifestResponse)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void ManifestManagerHost::OnRequestManifestResponse(int request_id,
+                                                    const Manifest& manifest) {
+  GetManifestCallback* callback = pending_callbacks_.Lookup(request_id);
+  if (!callback) {
+    LOG(ERROR) << "Received a request_id (" << request_id << ") from renderer "
+                  "with no associated callabck.";
+    return;
+  }
+
+  callback->Run(manifest);
+  pending_callbacks_.Remove(request_id);
+}
+
+} // namespace content