Change glimage to accept a type.

content/common/gpu/client/gpu_memory_buffer_impl_mac.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 "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl_io_surface.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl_shm.h"
 
 namespace content {
 
 scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImpl::Create(
     gfx::GpuMemoryBufferHandle handle,
     gfx::Size size,
-    unsigned internalformat) {
+    unsigned internalformat,
+    unsigned usage) {
+  if (usage == gfx::GpuMemoryBuffer::SCANOUT)
+    return scoped_ptr<GpuMemoryBufferImpl>();
+
   switch (handle.type) {
     case gfx::SHARED_MEMORY_BUFFER: {
       scoped_ptr<GpuMemoryBufferImplShm> buffer(
           new GpuMemoryBufferImplShm(size, internalformat));
       if (!buffer->Initialize(handle))
         return scoped_ptr<GpuMemoryBufferImpl>();
 
       return buffer.PassAs<GpuMemoryBufferImpl>();
     }
     case gfx::IO_SURFACE_BUFFER: {
       scoped_ptr<GpuMemoryBufferImplIOSurface> buffer(
           new GpuMemoryBufferImplIOSurface(size, internalformat));
       if (!buffer->Initialize(handle))
         return scoped_ptr<GpuMemoryBufferImpl>();
 
       return buffer.PassAs<GpuMemoryBufferImpl>();
     }
     default:
       return scoped_ptr<GpuMemoryBufferImpl>();
   }
 }
 
 }  // namespace content