Add a linear interpolation resampler.

services/media/audio/platform/generic/mixers/linear_sampler.h

 // Copyright 2015 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.
 
-#ifndef SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_MIXERS_POINT_SAMPLER_H_
-#define SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_MIXERS_POINT_SAMPLER_H_
+#ifndef SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_MIXERS_LINEAR_SAMPLER_H_
+#define SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_MIXERS_LINEAR_SAMPLER_H_
 
 #include "mojo/services/media/common/interfaces/media_types.mojom.h"
 #include "services/media/audio/platform/generic/mixer.h"
 
 namespace mojo {
 namespace media {
 namespace audio {
 namespace mixers {
 
-class PointSampler : public Mixer {
+class LinearSampler : public Mixer {
  public:
   static MixerPtr Select(const LpcmMediaTypeDetailsPtr& src_format,
                          const LpcmMediaTypeDetailsPtr& dst_format);
 
  protected:
-  PointSampler(uint32_t pos_filter_width, uint32_t neg_filter_width)
+  LinearSampler(uint32_t pos_filter_width, uint32_t neg_filter_width)
     : Mixer(pos_filter_width, neg_filter_width) {}
 };
 
 }  // namespace mixers
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo
 
-#endif  // SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_MIXERS_POINT_SAMPLER_H_
+#endif  // SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_MIXERS_LINEAR_SAMPLER_H_