Add half-float IOSurface GpuMemoryBuffer support

cc/resources/resource_format.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/resources/resource_format.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
@@ skipping 96 matching lines @@
     case BGRA_8888:
       return gfx::BufferFormat::BGRA_8888;
     case RED_8:
       return gfx::BufferFormat::R_8;
     case RGBA_4444:
       return gfx::BufferFormat::RGBA_4444;
     case RGBA_8888:
       return gfx::BufferFormat::RGBA_8888;
     case ETC1:
       return gfx::BufferFormat::ETC1;
+    case RGBA_F16:
+      return gfx::BufferFormat::RGBA_F16;
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
     case LUMINANCE_F16:
-    case RGBA_F16:
       break;
   }
   NOTREACHED();
   return gfx::BufferFormat::RGBA_8888;
 }
 
 bool IsResourceFormatCompressed(ResourceFormat format) {
   return format == ETC1;
 }
 
@@ skipping 10 matching lines @@
     case ETC1:
     case RED_8:
     case LUMINANCE_F16:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace cc