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 bb49ae01a2b6c4184751f98ba30a3077ff75097b..c5f803e577f4a84c35f06d04ca244811d49cdede 100644
--- a/cc/raster/raster_buffer_provider.cc
+++ b/cc/raster/raster_buffer_provider.cc
@@ -27,7 +27,6 @@ bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
     case RGBA_4444:
     case RGBA_8888:
     case BGRA_8888:
-    case RGBA_F16:
     case ETC1:
       return true;
     case ALPHA_8:
@@ -35,6 +34,7 @@ bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
     case RGB_565:
     case RED_8:
     case LUMINANCE_F16:
+    case RGBA_F16:
       return false;
   }
   NOTREACHED();