Add half-float IOSurface GpuMemoryBuffer support

cc/raster/raster_buffer_provider.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/raster/raster_buffer_provider.h"
 
 #include <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/raster/raster_source.h"
@@ skipping 10 matching lines @@
 
 RasterBufferProvider::~RasterBufferProvider() {}
 
 namespace {
 
 bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
   switch (format) {
     case RGBA_4444:
     case RGBA_8888:
     case BGRA_8888:
-    case RGBA_F16:
     case ETC1:
       return true;
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
     case RED_8:
     case LUMINANCE_F16:
+    case RGBA_F16:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // anonymous namespace
 
 // static
 void RasterBufferProvider::PlaybackToMemory(
@@ skipping 98 matching lines @@
     case RED_8:
     case LUMINANCE_F16:
     case RGBA_F16:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace cc