Change to interface to M19, add a few more test cases to test_audio.

ppapi/c/ppb_audio_config.h

 /* 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.
  */
 
-/* From ppb_audio_config.idl modified Thu Feb 16 16:23:46 2012. */
+/* From ppb_audio_config.idl modified Wed Feb 22 14:49:51 2012. */
 
 #ifndef PPAPI_C_PPB_AUDIO_CONFIG_H_
 #define PPAPI_C_PPB_AUDIO_CONFIG_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 
@@ skipping 97 matching lines @@
    * closest to the requested count. The sample frame count determines the
    * overall latency of audio. Since one "frame" is always buffered in advance,
    * smaller frame counts will yield lower latency, but higher CPU utilization.
    *
    * Supported sample frame counts will vary by hardware and system (consider
    * that the local system might be anywhere from a cell phone or a high-end
    * audio workstation). Sample counts less than
    * <code>PP_AUDIOMINSAMPLEFRAMECOUNT</code> and greater than
    * <code>PP_AUDIOMAXSAMPLEFRAMECOUNT</code> are never supported on any
    * system, but values in between aren't necessarily valid. This function
-   * will return a supported count closest to the requested value.
+   * will return a supported count closest to the requested frame count.
    *
    * RecommendSampleFrameCount() result is intended for audio output devices.
    *
    * @param[in] instance
    * @param[in] sample_rate A <code>PP_AudioSampleRate</code> which is either
    * <code>PP_AUDIOSAMPLERATE_44100</code> or
    * <code>PP_AUDIOSAMPLERATE_48000.</code>
    * @param[in] requested_sample_frame_count A <code>uint_32t</code> requested
    * frame count.
    *
@@ skipping 36 matching lines @@
    *
    * @return A <code>uint32_t</code> containing sample frame count or
    * 0 if the resource is invalid. Refer to
    * RecommendSampleFrameCount() for more on sample frame counts.
    */
   uint32_t (*GetSampleFrameCount)(PP_Resource config);
   /**
    * RecommendSampleRate() returns the native sample rate that the browser
    * is using in the backend.  Applications that use the recommended sample
    * rate will have potentially better latency and fidelity.  The return value
-   * is indended for audio output devices.
+   * is indended for audio output devices.  If the output sample rate cannot be
+   * determined, this function can return PP_AUDIOSAMPLERATE_NONE.
    *
    * @param[in] instance
    *
    * @return A <code>uint32_t</code> containing the recommended sample frame
    * count if successful.
    */
   PP_AudioSampleRate (*RecommendSampleRate)(PP_Instance instance);
 };
 
 typedef struct PPB_AudioConfig_1_1 PPB_AudioConfig;
 
 struct PPB_AudioConfig_1_0 {
   PP_Resource (*CreateStereo16Bit)(PP_Instance instance,
                                    PP_AudioSampleRate sample_rate,
                                    uint32_t sample_frame_count);
   uint32_t (*RecommendSampleFrameCount)(
       PP_AudioSampleRate sample_rate,
       uint32_t requested_sample_frame_count);
   PP_Bool (*IsAudioConfig)(PP_Resource resource);
   PP_AudioSampleRate (*GetSampleRate)(PP_Resource config);
   uint32_t (*GetSampleFrameCount)(PP_Resource config);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_AUDIO_CONFIG_H_ */