ppapi: define PPB_AudioEncoder API

native_client_sdk/src/libraries/ppapi_cpp/library.dsc

 {
   'SEARCH': [
       '../../../../ppapi/cpp',
       '../../../../ppapi/cpp/dev',
       '../../../../ppapi/utility',
       '../../../../ppapi/utility/graphics',
       '../../../../ppapi/utility/threading',
       '../../../../ppapi/utility/websocket',
   ],
   'TARGETS': [
     {
       'NAME' : 'ppapi_cpp',
       'TYPE' : 'lib',
       'SOURCES' : [
         # ppapi/cpp
         'array_output.cc',
         'audio.cc',
         'audio_buffer.cc',
         'audio_config.cc',
+        'audio_encoder.cc',
         'compositor.cc',
         'compositor_layer.cc',
         'core.cc',
         'directory_entry.cc',
         'file_io.cc',
         'file_ref.cc',
         'file_system.cc',
         'fullscreen.cc',
         'graphics_2d.cc',
         'graphics_3d.cc',
@@ skipping 54 matching lines @@
         'simple_thread.cc',
       ],
     }
   ],
   'HEADERS': [
     {
       'FILES': [
         'array_output.h',
         'audio_buffer.h',
         'audio_config.h',
+        'audio_encoder.h',
         'audio.h',
         'completion_callback.h',
         'compositor.h',
         'compositor_layer.h',
         'core.h',
         'directory_entry.h',
         'file_io.h',
         'file_ref.h',
         'file_system.h',
         'fullscreen.h',
@@ skipping 91 matching lines @@
         'lock.h',
         'simple_thread.h',
       ],
       'DEST': 'include/ppapi/utility/threading',
     },
   ],
   'DEST': 'src',
   'NAME': 'ppapi_cpp',
 }