Change the way we are sending audio data to driver when using WaveOut API.

media/audio/win/audio_output_win_unittest.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 <windows.h>
 #include <mmsystem.h>
 
 #include "base/basictypes.h"
 #include "base/base_paths.h"
 #include "base/file_util.h"
@@ skipping 569 matching lines @@
                       AudioParameters::kAudioCDSampleRate, 16, samples_100_ms));
   ASSERT_TRUE(NULL != oas);
 
   NiceMock<MockAudioSource> source;
   EXPECT_TRUE(oas->Open());
 
   uint32 bytes_100_ms = samples_100_ms * 2;
 
   // We expect the amount of pending bytes will reaching 2 times of
   // |bytes_100_ms| because the audio output stream has a triple buffer scheme.
-  // And then we will try to provide zero data so the amount of pending bytes
-  // will go down and eventually read zero.
+  // From that it would decrease as we are playing the data but not providing
+  // new one. And then we will try to provide zero data so the amount of
+  // pending bytes will go down and eventually read zero.
   InSequence s;
   EXPECT_CALL(source, OnMoreData(oas, NotNull(), bytes_100_ms,
                                  Field(&AudioBuffersState::pending_bytes, 0)))
       .WillOnce(Return(bytes_100_ms));
   EXPECT_CALL(source, OnMoreData(oas, NotNull(), bytes_100_ms,
                                  Field(&AudioBuffersState::pending_bytes,
                                        bytes_100_ms)))
       .WillOnce(Return(bytes_100_ms));
   EXPECT_CALL(source, OnMoreData(oas, NotNull(), bytes_100_ms,
                                  Field(&AudioBuffersState::pending_bytes,
                                        2 * bytes_100_ms)))
       .WillOnce(Return(bytes_100_ms));
   EXPECT_CALL(source, OnMoreData(oas, NotNull(), bytes_100_ms,
                                  Field(&AudioBuffersState::pending_bytes,
                                        2 * bytes_100_ms)))
-      .WillOnce(Return(0));
+      .Times(AnyNumber())
+      .WillRepeatedly(Return(0));
   EXPECT_CALL(source, OnMoreData(oas, NotNull(), bytes_100_ms,
                                  Field(&AudioBuffersState::pending_bytes,
                                        bytes_100_ms)))
-      .WillOnce(Return(0));
+      .Times(AnyNumber())
+      .WillRepeatedly(Return(0));
   EXPECT_CALL(source, OnMoreData(oas, NotNull(), bytes_100_ms,
                                  Field(&AudioBuffersState::pending_bytes, 0)))
       .Times(AnyNumber())
       .WillRepeatedly(Return(0));
 
   oas->Start(&source);
   ::Sleep(500);
   oas->Stop();
   oas->Close();
 }
@@ skipping 103 matching lines @@
 
   oas->Start(&source);
 
   ::WaitForSingleObject(thread, INFINITE);
   ::CloseHandle(thread);
   delete sockets[1];
 
   oas->Stop();
   oas->Close();
 }