Implement ManifestManager to handle manifest in content/

content/browser/manifest/manifest_manager_host.cc

+// 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() {
+}
+
+ManifestManagerHost::CallbackMap* ManifestManagerHost::GetCallbackMapForFrame(
+    RenderFrameHost* render_frame_host) {
+  FrameCallbackMap::iterator it = pending_callbacks_.find(render_frame_host);
+  if (it == pending_callbacks_.end())
+    return 0;
+  return it->second;

[kenneth.christiansen, 2014/09/11 09:33:09]

Wouldn't it be nicer in one line?

return (it != pending_callbacks_.end()) ? it->second : 0;

[mlamouri (slow - plz ping), 2014/09/11 10:30:32]

Done.

+}
+
+void ManifestManagerHost::RenderFrameDeleted(
+    RenderFrameHost* render_frame_host) {
+  CallbackMap* callbacks = GetCallbackMapForFrame(render_frame_host);
+  if (!callbacks)
+    return;
+
+  // Before deleting the callbacks, make sure they are called with a failure
+  // state.
+  CallbackMap::const_iterator it(callbacks);
+  for (; !it.IsAtEnd(); it.Advance())
+    it.GetCurrentValue()->Run(Manifest());

[kenneth.christiansen, 2014/09/11 09:33:09]

Is that a failure state?

[mlamouri (slow - plz ping), 2014/09/11 10:30:32]

Yes. An empty manifest is returned if no manifest was found, the manifest failed
to parse, etc.

+
+  pending_callbacks_.erase(render_frame_host);
+}
+
+void ManifestManagerHost::GetManifest(RenderFrameHost* render_frame_host,
+                                      const GetManifestCallback& callback) {
+  CallbackMap* callbacks = GetCallbackMapForFrame(render_frame_host);
+  if (!callbacks) {
+    callbacks = new CallbackMap();
+    pending_callbacks_[render_frame_host] = callbacks;
+  }
+
+  int request_id = 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_WITH_PARAM(ManifestManagerHost, message,
+                                   render_frame_host)
+    IPC_MESSAGE_HANDLER(ManifestManagerHostMsg_RequestManifestResponse,
+                        OnRequestManifestResponse)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void ManifestManagerHost::OnRequestManifestResponse(
+    RenderFrameHost* render_frame_host,
+    int request_id,
+    const Manifest& manifest) {
+  CallbackMap* callbacks = GetCallbackMapForFrame(render_frame_host);
+  if (!callbacks) {
+    LOG(ERROR) << "Received a ManifestResponse for a RFH not waiting for it";

[kenneth.christiansen, 2014/09/11 09:33:09]

without waiting for it?

Unexpectedly received a ManifestResponse for a RFH without waiting for it

[mlamouri (slow - plz ping), 2014/09/11 10:30:32]

"Unexpected ManifestResponse to RFH."

+    return;
+  }
+
+  GetManifestCallback* callback = callbacks->Lookup(request_id);
+  if (!callback) {
+    LOG(ERROR) << "Received a request_id (" << request_id << ") from renderer "
+                  "with no associated callabck.";

[kenneth.christiansen, 2014/09/11 09:33:09]

spelling issue: callabck.

[mlamouri (slow - plz ping), 2014/09/11 10:30:32]

Done.

+    return;
+  }
+
+  callback->Run(manifest);
+  callbacks->Remove(request_id);
+  if (callbacks->IsEmpty()) {
+    delete callbacks;
+    pending_callbacks_.erase(render_frame_host);
+  }
+}
+
+} // namespace content