Introduce AudioOutputResampler for browser side resampling.

media/base/multi_channel_resampler_unittest.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 <cmath>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 45 matching lines @@
 
   void MultiChannelTest(int channels, int frames, double expected_max_rms_error,
                         double expected_max_error) {
     InitializeAudioData(channels, frames);
     MultiChannelResampler resampler(
         channels, kScaleFactor, base::Bind(
             &MultiChannelResamplerTest::ProvideInput,
             base::Unretained(this)));
     resampler.Resample(audio_bus_.get(), frames);
     TestValues(expected_max_rms_error, expected_max_error);
+
+    // Verify Flush() of our internal state.
+    EXPECT_NE(resampler.last_frame_count_, 0);
+    resampler.Flush();
+    EXPECT_EQ(resampler.last_frame_count_, 0);
   }
 
   void HighLatencyTest(int channels) {
     MultiChannelTest(channels, kHighLatencySize, kHighLatencyMaxRMSError,
                      kHighLatencyMaxError);
   }
 
   void LowLatencyTest(int channels) {
     MultiChannelTest(channels, kLowLatencySize, kLowLatencyMaxRMSError,
                      kLowLatencyMaxError);
@@ skipping 35 matching lines @@
 TEST_P(MultiChannelResamplerTest, LowLatency) {
   LowLatencyTest(GetParam());
 }
 
 // Test common channel layouts: mono, stereo, 5.1, 7.1.
 INSTANTIATE_TEST_CASE_P(
     MultiChannelResamplerTest, MultiChannelResamplerTest,
     testing::Values(1, 2, 6, 8));
 
 }  // namespace media