Handle failed GpuMemoryBuffer allocations properly.

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.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_io_surface.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "content/common/gpu/client/gpu_memory_buffer_factory_host.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace content {
 namespace {
 
 base::StaticAtomicSequenceNumber g_next_buffer_id;
 
 void GpuMemoryBufferDeleted(const gfx::GpuMemoryBufferHandle& handle,
                             uint32 sync_point) {
   GpuMemoryBufferFactoryHost::GetInstance()->DestroyGpuMemoryBuffer(handle,
                                                                     sync_point);
 }
 
 void GpuMemoryBufferCreated(
     const gfx::Size& size,
     gfx::GpuMemoryBuffer::Format format,
     const GpuMemoryBufferImpl::CreationCallback& callback,
     const gfx::GpuMemoryBufferHandle& handle) {
+  if (handle.is_null()) {
+    callback.Run(scoped_ptr<GpuMemoryBufferImpl>());
+    return;
+  }
+
   DCHECK_EQ(gfx::IO_SURFACE_BUFFER, handle.type);
-
   callback.Run(GpuMemoryBufferImplIOSurface::CreateFromHandle(
       handle, size, format, base::Bind(&GpuMemoryBufferDeleted, handle)));
 }
 
 void GpuMemoryBufferCreatedForChildProcess(
     const GpuMemoryBufferImpl::AllocationCallback& callback,
     const gfx::GpuMemoryBufferHandle& handle) {
-  DCHECK_EQ(gfx::IO_SURFACE_BUFFER, handle.type);
+  DCHECK_IMPLIES(!handle.is_null(), gfx::IO_SURFACE_BUFFER == handle.type);
 
   callback.Run(handle);
 }
 
 }  // namespace
 
 GpuMemoryBufferImplIOSurface::GpuMemoryBufferImplIOSurface(
     const gfx::Size& size,
     Format format,
     const DestructionCallback& callback,
@@ skipping 132 matching lines @@
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::IO_SURFACE_BUFFER;
   handle.io_surface_id = IOSurfaceGetID(io_surface_);
   return handle;
 }
 
 }  // namespace content