Add support for multichannel playback to OpenSLES output.

media/audio/android/opensles_util.h

Index: media/audio/android/opensles_util.h
diff --git a/media/audio/android/opensles_util.h b/media/audio/android/opensles_util.h
index bc6d0410af9a7ba2b25b655f4d6f169e7274bdbd..2673d14f3b6a2533fbc3b575a238dd630521b359 100644
--- a/media/audio/android/opensles_util.h
+++ b/media/audio/android/opensles_util.h
@@ -8,6 +8,7 @@
 #include <SLES/OpenSLES.h>
 
 #include "base/logging.h"
+#include "media/base/media_export.h"
 
 namespace media {
 
@@ -40,6 +41,11 @@ class ScopedSLObject {
 
 typedef ScopedSLObject<SLObjectItf, const SLObjectItf_*> ScopedSLObjectItf;
 
+// Guesses the channel mask for a given channel count. Android does not offer a
+// way to configure the layout, so this will be incorrect for less common
+// channel layouts.
+MEDIA_EXPORT SLuint32 ChannelCountToSLESChannelMask(int channel_count);
+
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_