media-internals: Store updates when cannot update.

content/browser/media/media_internals_proxy.cc

 // Copyright (c) 2012 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/media/media_internals_proxy.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 51 matching lines @@
 
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(
           &MediaInternalsProxy::StopObservingMediaInternalsOnIOThread, this));
 }
 
 void MediaInternalsProxy::GetEverything() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
-  // Ask MediaInternals for all its data.
+  MediaInternals::GetInstance()->SendHistoricalMediaEvents();
+
+  // Ask MediaInternals for its data on IO thread.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&MediaInternalsProxy::GetEverythingOnIOThread, this));
 
   // Send the page names for constants.
   CallJavaScriptFunctionOnUIThread("media.onReceiveConstants", GetConstants());
 }
 
 void MediaInternalsProxy::OnAddEntry(const net::NetLog::Entry& entry) {
   bool is_event_interesting = false;
@@ skipping 46 matching lines @@
 void MediaInternalsProxy::StopObservingMediaInternalsOnIOThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (GetContentClient()->browser()->GetNetLog()) {
     net::NetLog* net_log = GetContentClient()->browser()->GetNetLog();
     net_log->DeprecatedRemoveObserver(this);
   }
 }
 
 void MediaInternalsProxy::GetEverythingOnIOThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  // TODO(xhwang): Investigate whether we can update on UI thread directly.
   MediaInternals::GetInstance()->SendAudioStreamData();
   MediaInternals::GetInstance()->SendVideoCaptureDeviceCapabilities();
 }
 
 void MediaInternalsProxy::UpdateUIOnUIThread(const base::string16& update) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   // Don't forward updates to a destructed UI.
   if (handler_)
     handler_->OnUpdate(update);
 }
@@ skipping 24 matching lines @@
     const std::string& function, base::Value* args) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   scoped_ptr<base::Value> args_value(args);
   std::vector<const base::Value*> args_vector;
   args_vector.push_back(args_value.get());
   base::string16 update = WebUI::GetJavascriptCall(function, args_vector);
   UpdateUIOnUIThread(update);
 }
 
 }  // namespace content