Initial implementation of music manager private API.

chrome/browser/extensions/api/music_manager_private/music_manager_private_api.cc

+// Copyright 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 "chrome/browser/extensions/api/music_manager_private/music_manager_private_api.h"
+#include "chrome/browser/extensions/api/music_manager_private/device_id.h"
+
+using content::BrowserThread;
+
+namespace {
+const char kDeviceIDNotSupported[] =
+    "Device ID API is not supported on this platform.";
+

[battre, 2013/05/23 09:44:16]

nit: remove newline?

[rpaquay, 2013/05/23 17:40:38]

Done.

+}
+
+namespace extensions {
+
+namespace api {
+
+MusicManagerPrivateGetDeviceIdFunction::
+  MusicManagerPrivateGetDeviceIdFunction() {

[battre, 2013/05/23 09:44:16]

nit: -2 spaces? (also below)

[rpaquay, 2013/05/23 17:40:38]

Done.

+}
+
+MusicManagerPrivateGetDeviceIdFunction::
+  ~MusicManagerPrivateGetDeviceIdFunction() {
+}
+
+bool MusicManagerPrivateGetDeviceIdFunction::RunImpl() {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&MusicManagerPrivateGetDeviceIdFunction::ComputeOnIOThread,
+                 this));
+
+  return true;
+}
+
+void  MusicManagerPrivateGetDeviceIdFunction::ComputeOnIOThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  std::string salt = this->extension_id();
+  std::string result = device_id::GetDeviceID(salt);
+  bool response;
+  if (result.empty()) {
+    SetError(kDeviceIDNotSupported);
+    response = false;
+  } else {
+    SetResult(Value::CreateStringValue(result));
+    response = true;
+  }
+
+  content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&MusicManagerPrivateGetDeviceIdFunction::SendResponse,
+                 this,
+                 response));
+}
+
+} // namespace api
+
+} // namespace extensions