Switch audio synchronization from sleep() based to select() based.

ppapi/proxy/ppb_audio_proxy.cc

Index: ppapi/proxy/ppb_audio_proxy.cc
diff --git a/ppapi/proxy/ppb_audio_proxy.cc b/ppapi/proxy/ppb_audio_proxy.cc
index 49ed0afb2d2e255757645b0347d42e0567e79680..58f5abc0d4141f747e3a2845dd1682ccfc4388ff 100644
--- a/ppapi/proxy/ppb_audio_proxy.cc
+++ b/ppapi/proxy/ppb_audio_proxy.cc
@@ -6,7 +6,6 @@
 
 #include "base/compiler_specific.h"
 #include "base/threading/simple_thread.h"
-#include "media/audio/shared_memory_util.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_audio.h"
 #include "ppapi/c/ppb_audio_config.h"
@@ -262,15 +261,7 @@ void PPB_Audio_Proxy::AudioChannelConnected(
   // us, as long as the remote side always closes the handles it receives
   // (in OnMsgNotifyAudioStreamCreated), even in the failure case.
   SerializedHandle fd_wrapper(SerializedHandle::SOCKET, socket_handle);
-
-  // Note that we must call TotalSharedMemorySizeInBytes because
-  // Audio allocates extra space in shared memory for book-keeping, so the
-  // actual size of the shared memory buffer is larger than audio_buffer_length.
-  // When sending to NaCl, NaClIPCAdapter expects this size to match the size
-  // of the full shared memory buffer.
-  SerializedHandle handle_wrapper(
-      shared_memory,
-      media::TotalSharedMemorySizeInBytes(audio_buffer_length));
+  SerializedHandle handle_wrapper(shared_memory, audio_buffer_length);
   dispatcher()->Send(new PpapiMsg_PPBAudio_NotifyAudioStreamCreated(
       API_ID_PPB_AUDIO, resource, result_code, fd_wrapper, handle_wrapper));
 }
@@ -333,13 +324,8 @@ void PPB_Audio_Proxy::OnMsgNotifyAudioStreamCreated(
   } else {
     EnterResourceNoLock<PPB_AudioConfig_API> config(
         static_cast<Audio*>(enter.object())->GetCurrentConfig(), true);
-    // See the comment above about how we must call
-    // TotalSharedMemorySizeInBytes to get the actual size of the buffer. Here,
-    // we must call PacketSizeInBytes to get back the size of the audio buffer,
-    // excluding the bytes that audio uses for book-keeping.
     static_cast<Audio*>(enter.object())->SetStreamInfo(
-        enter.resource()->pp_instance(), handle.shmem(),
-        media::PacketSizeInBytes(handle.size()),
+        enter.resource()->pp_instance(), handle.shmem(), handle.size(),
         IPC::PlatformFileForTransitToPlatformFile(socket_handle.descriptor()),
         config.object()->GetSampleRate(),
         config.object()->GetSampleFrameCount());