Add half-float IOSurface GpuMemoryBuffer support

cc/raster/raster_buffer_provider.cc

Index: cc/raster/raster_buffer_provider.cc
diff --git a/cc/raster/raster_buffer_provider.cc b/cc/raster/raster_buffer_provider.cc
index fe76a0a4204bb74e0efd460a92ea640529fc01fe..7b3dfc6710ff2a254cfb3f884a4593e4ae648aca 100644
--- a/cc/raster/raster_buffer_provider.cc
+++ b/cc/raster/raster_buffer_provider.cc
@@ -28,7 +28,6 @@ bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
     case RGBA_4444:
     case RGBA_8888:
     case BGRA_8888:
-    case RGBA_F16:
     case ETC1:
       return true;
     case ALPHA_8:
@@ -36,6 +35,7 @@ bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
     case RGB_565:
     case RED_8:
     case LUMINANCE_F16:
+    case RGBA_F16:
       return false;
   }
   NOTREACHED();