Add half-float IOSurface GpuMemoryBuffer support

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc

 // Copyright 2014 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 "gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 117 matching lines @@
       // by the block size.
       return size.width() % 4 == 0 && size.height() % 4 == 0;
     case gfx::BufferFormat::R_8:
     case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::RGBX_8888:
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
+    case gfx::BufferFormat::RGBA_F16:
       return true;
     case gfx::BufferFormat::YVU_420:
     case gfx::BufferFormat::YUV_420_BIPLANAR: {
       size_t num_planes = gfx::NumberOfPlanesForBufferFormat(format);
       for (size_t i = 0; i < num_planes; ++i) {
         size_t factor = gfx::SubsamplingFactorForBufferFormat(format, i);
         if (size.width() % factor || size.height() % factor)
           return false;
       }
       return true;
@@ skipping 56 matching lines @@
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SHARED_MEMORY_BUFFER;
   handle.id = id_;
   handle.offset = offset_;
   handle.stride = stride_;
   handle.handle = shared_memory_->handle();
   return handle;
 }
 
 }  // namespace gpu