Handle failed GpuMemoryBuffer allocations properly.

content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.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 "content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
                             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::SURFACE_TEXTURE_BUFFER, handle.type);
-
   callback.Run(GpuMemoryBufferImplSurfaceTexture::CreateFromHandle(
       handle, size, format, base::Bind(&GpuMemoryBufferDeleted, handle)));
 }
 
 void GpuMemoryBufferCreatedForChildProcess(
     const GpuMemoryBufferImpl::AllocationCallback& callback,
     const gfx::GpuMemoryBufferHandle& handle) {
-  DCHECK_EQ(gfx::SURFACE_TEXTURE_BUFFER, handle.type);
+  DCHECK_IMPLIES(!handle.is_null(), gfx::SURFACE_TEXTURE_BUFFER == handle.type);
 
   callback.Run(handle);
 }
 
 }  // namespace
 
 GpuMemoryBufferImplSurfaceTexture::GpuMemoryBufferImplSurfaceTexture(
     const gfx::Size& size,
     Format format,
     const DestructionCallback& callback,
@@ skipping 159 matching lines @@
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplSurfaceTexture::GetHandle()
     const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SURFACE_TEXTURE_BUFFER;
   handle.global_id = id_;
   return handle;
 }
 
 }  // namespace content