Make MediaInternalsUI talk to MediaInternals.

chrome/browser/ui/webui/media_internals/media_internals_proxy.cc

+// Copyright (c) 2011 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/ui/webui/media_internals/media_internals_proxy.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/io_thread.h"
+#include "chrome/browser/media/media_internals.h"
+#include "chrome/browser/ui/webui/media_internals/media_internals_handler.h"
+
+MediaInternalsProxy::MediaInternalsProxy() {
+  io_thread_ = g_browser_process->io_thread();
+}
+
+void MediaInternalsProxy::Attach(MediaInternalsMessageHandler* handler) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  handler_ = handler;
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+      NewRunnableMethod(this,
+          &MediaInternalsProxy::ObserveMediaInternalsOnIOThread));
+}
+
+void MediaInternalsProxy::Detach() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  handler_ = NULL;
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+      NewRunnableMethod(this,
+          &MediaInternalsProxy::StopObservingMediaInternalsOnIOThread));
+}
+
+void MediaInternalsProxy::GetEverything() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+      NewRunnableMethod(this, &MediaInternalsProxy::GetEverythingOnIOThread));
+}
+
+void MediaInternalsProxy::OnUpdate(const string16& update) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(this,
+          &MediaInternalsProxy::UpdateUIOnUIThread, update));
+}
+
+MediaInternalsProxy::~MediaInternalsProxy() {}
+
+void MediaInternalsProxy::ObserveMediaInternalsOnIOThread() {
+  io_thread_->globals()->media.media_internals->AddUI(this);
+}
+
+void MediaInternalsProxy::StopObservingMediaInternalsOnIOThread() {
+  io_thread_->globals()->media.media_internals->RemoveUI(this);
+}
+
+void MediaInternalsProxy::GetEverythingOnIOThread() {
+  io_thread_->globals()->media.media_internals->SendEverything();
+}
+
+void MediaInternalsProxy::UpdateUIOnUIThread(const string16& update) {
+  // Don't forward updates to a destructed UI.
+  if (handler_)
+    handler_->OnUpdate(update);
+}