Introduce shared_memory_support media target for PPAPI

media/base/channel_layout.h

Index: media/base/channel_layout.h
diff --git a/media/base/channel_layout.h b/media/base/channel_layout.h
index ac10661daf90ebb4d223a73ba1ff56d6169a5a6f..9e884204177b92336ec0dda96093144d001d98f6 100644
--- a/media/base/channel_layout.h
+++ b/media/base/channel_layout.h
@@ -5,7 +5,6 @@
 #ifndef MEDIA_BASE_CHANNEL_LAYOUT_H_
 #define MEDIA_BASE_CHANNEL_LAYOUT_H_
 
-#include "build/build_config.h"
 #include "media/base/media_export.h"
 
 enum ChannelLayout {
@@ -78,15 +77,14 @@ enum Channels {
   CHANNELS_MAX
 };
 
-#if defined(OS_MACOSX) || defined(USE_PULSEAUDIO)
 // The channel orderings for each layout as specified by FFmpeg.
 // Values represent the index of each channel in each layout. For example, the
 // left side surround sound channel in FFmpeg's 5.1 layout is in the 5th
 // position (because the order is L, R, C, LFE, LS, RS), so
 // kChannelOrderings[CHANNEL_LAYOUT_5POINT1][SIDE_LEFT] = 4;
 // Values of -1 mean the channel at that index is not used for that layout.
-extern const int kChannelOrderings[CHANNEL_LAYOUT_MAX][CHANNELS_MAX];
-#endif
+MEDIA_EXPORT extern const int
+kChannelOrderings[CHANNEL_LAYOUT_MAX][CHANNELS_MAX];
 
 // Returns the number of channels in a given ChannelLayout.
 MEDIA_EXPORT int ChannelLayoutToChannelCount(ChannelLayout layout);