Allow creating GLImage-backed textures with glTexStorage2D.

gpu/ipc/service/gpu_memory_buffer_factory_io_surface.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/service/gpu_memory_buffer_factory_io_surface.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "gpu/GLES2/gl2extchromium.h"
@@ skipping 74 matching lines @@
       new gl::GLImageIOSurface(size, internalformat));
   if (!image->Initialize(it->second.get(), handle.id, format))
     return scoped_refptr<gl::GLImage>();
 
   return image;
 }
 
 scoped_refptr<gl::GLImage>
 GpuMemoryBufferFactoryIOSurface::CreateAnonymousImage(const gfx::Size& size,
                                                       gfx::BufferFormat format,
+                                                      gfx::BufferUsage usage,
                                                       unsigned internalformat) {
   // Note that the GpuMemoryBufferId and child id don't matter since the texture
   // will never be directly exposed to other processes, only via a mailbox.
   int gmb_id = 0;
   int client_id = 0;
-  gfx::GpuMemoryBufferHandle handle = CreateGpuMemoryBuffer(
-      gfx::GpuMemoryBufferId(gmb_id), size, format, gfx::BufferUsage::SCANOUT,
-      client_id, gpu::kNullSurfaceHandle);
+  gfx::GpuMemoryBufferHandle handle =
+      CreateGpuMemoryBuffer(gfx::GpuMemoryBufferId(gmb_id), size, format, usage,
+                            client_id, gpu::kNullSurfaceHandle);
 
   base::ScopedCFTypeRef<IOSurfaceRef> io_surface;
   io_surface.reset(IOSurfaceLookupFromMachPort(handle.mach_port.get()));
   DCHECK_NE(nullptr, io_surface.get());
   scoped_refptr<gl::GLImageIOSurface> image(
       new gl::GLImageIOSurface(size, internalformat));
   if (!image->Initialize(io_surface.get(), handle.id, format))
     return scoped_refptr<gl::GLImage>();
   return image;
 }
 
 unsigned GpuMemoryBufferFactoryIOSurface::RequiredTextureType() {
   return GL_TEXTURE_RECTANGLE_ARB;
 }
 
 bool GpuMemoryBufferFactoryIOSurface::SupportsFormatRGB() {
   return false;
 }
 
 }  // namespace gpu