Handle failed GpuMemoryBuffer allocations properly.

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc b/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
index 9e46404a58f91d4123e9588e57d757a27e76fc88..bbe9604a9b8985fa4e33334dbcc79efddacb4a7b 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
@@ -26,8 +26,12 @@ void GpuMemoryBufferCreated(
     gfx::GpuMemoryBuffer::Format format,
     const GpuMemoryBufferImpl::CreationCallback& callback,
     const gfx::GpuMemoryBufferHandle& handle) {
-  DCHECK_EQ(gfx::IO_SURFACE_BUFFER, handle.type);
+  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)));
 }
@@ -35,7 +39,7 @@ void GpuMemoryBufferCreated(
 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);
 }