Revert 207992: This looks like a reland of r207983, which was reverted in

trunk/src/content/browser/renderer_host/media/midi_host.cc

Index: trunk/src/content/browser/renderer_host/media/midi_host.cc
===================================================================
--- trunk/src/content/browser/renderer_host/media/midi_host.cc	(revision 207994)
+++ trunk/src/content/browser/renderer_host/media/midi_host.cc	(working copy)
@@ -1,99 +0,0 @@
-// Copyright (c) 2013 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/renderer_host/media/midi_host.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/debug/trace_event.h"
-#include "base/process.h"
-#include "content/browser/browser_main_loop.h"
-#include "content/browser/media/media_internals.h"
-#include "content/common/media/midi_messages.h"
-#include "content/public/browser/content_browser_client.h"
-#include "content/public/browser/media_observer.h"
-#include "media/midi/midi_manager.h"
-
-using media::MIDIManager;
-using media::MIDIPortInfoList;
-
-namespace content {
-
-MIDIHost::MIDIHost(media::MIDIManager* midi_manager)
-    : midi_manager_(midi_manager) {
-}
-
-MIDIHost::~MIDIHost() {
-  if (midi_manager_)
-    midi_manager_->ReleaseAccess(this);
-}
-
-void MIDIHost::OnChannelClosing() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  BrowserMessageFilter::OnChannelClosing();
-}
-
-void MIDIHost::OnDestruct() const {
-  BrowserThread::DeleteOnIOThread::Destruct(this);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// IPC Messages handler
-bool MIDIHost::OnMessageReceived(const IPC::Message& message,
-                                 bool* message_was_ok) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(MIDIHost, message, *message_was_ok)
-    IPC_MESSAGE_HANDLER(MIDIHostMsg_RequestAccess, OnRequestAccess)
-    IPC_MESSAGE_HANDLER(MIDIHostMsg_SendData, OnSendData)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
-
-  return handled;
-}
-
-void MIDIHost::OnRequestAccess(int client_id, int access) {
-  MIDIPortInfoList input_ports;
-  MIDIPortInfoList output_ports;
-
-  // Ask permission and register to receive MIDI data.
-  bool approved = false;
-  if (midi_manager_) {
-    approved = midi_manager_->RequestAccess(this, access);
-    if (approved) {
-      input_ports = midi_manager_->input_ports();
-      output_ports = midi_manager_->output_ports();
-    }
-  }
-
-  Send(new MIDIMsg_AccessApproved(
-       client_id,
-       access,
-       approved,
-       input_ports,
-       output_ports));
-}
-
-void MIDIHost::OnSendData(int port,
-                          const std::vector<uint8>& data,
-                          double timestamp) {
-  // TODO(crogers): we need to post this to a dedicated thread for
-  // sending MIDI. For now, we will not implement the sending of MIDI data.
-  NOTIMPLEMENTED();
-  // if (midi_manager_)
-  //   midi_manager_->SendMIDIData(port, data.data(), data.size(), timestamp);
-}
-
-void MIDIHost::ReceiveMIDIData(
-    int port_index,
-    const uint8* data,
-    size_t length,
-    double timestamp) {
-  TRACE_EVENT0("midi", "MIDIHost::ReceiveMIDIData");
-  // Send to the renderer.
-  std::vector<uint8> v(data, data + length);
-  Send(new MIDIMsg_DataReceived(port_index, v, timestamp));
-}
-
-}  // namespace content