Refactoring to share MockAudioOutputStream implementations across 3 platforms

chrome/browser/renderer_host/audio_renderer_host_unittest.cc

 // Copyright (c) 2009 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 "base/message_loop.h"
 #include "base/process_util.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/renderer_host/audio_renderer_host.h"
 #include "chrome/common/render_messages.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 164 matching lines @@
   }
 
   int current_stream_id_;
   scoped_refptr<MockAudioRendererHost> host_;
   scoped_ptr<MessageLoop> message_loop_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHostTest);
 };
 
-// Audio output stream only works stably on windows. Also there's no mock
-// audio output streams for mac and linux.
-// TODO(hclam): make these tests work on mac and linux.
-#if defined(OS_WIN)
-
 TEST_F(AudioRendererHostTest, MockStreamDataConversation) {
   scoped_ptr<AudioRendererHost::IPCAudioSource> source(CreateMockStream());
 
   // We will receive packet requests until the buffer is full. We first send
   // three packets of 16KB, then we send packets of 1KB until the buffer is
   // full. Then there will no more packet requests.
   InSequence s;
   EXPECT_CALL(*host_,
       OnRequestPacket(kRouteId, current_stream_id_, kPacketSize, _));
   EXPECT_CALL(*host_,
@@ skipping 19 matching lines @@
   source->NotifyPacketReady(kPacketSize);
   source->NotifyPacketReady(kPacketSize);
   source->NotifyPacketReady(kStep);
   source->NotifyPacketReady(kStep);
   source->NotifyPacketReady(kStep);
   source->NotifyPacketReady(kStep);
   source->Start();
   source->Close();
 }
 
-#endif