services/ui: Add mojom API for creating/destroying gpu memory buffer.

services/ui/gpu/gpu_service_internal.cc

Index: services/ui/gpu/gpu_service_internal.cc
diff --git a/services/ui/gpu/gpu_service_internal.cc b/services/ui/gpu/gpu_service_internal.cc
index 218d18424603e44dcbe72cc3e21de6cf0aa98782..95c13730919b417bc3b440830ebf7bad8bb4e231 100644
--- a/services/ui/gpu/gpu_service_internal.cc
+++ b/services/ui/gpu/gpu_service_internal.cc
@@ -61,16 +61,17 @@ void GpuServiceInternal::Add(mojom::GpuServiceInternalRequest request) {
   binding_.Bind(std::move(request));
 }
 
-gfx::GpuMemoryBufferHandle GpuServiceInternal::CreateGpuMemoryBuffer(
+void GpuServiceInternal::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     int client_id,
-    gpu::SurfaceHandle surface_handle) {
+    gpu::SurfaceHandle surface_handle,
+    const CreateGpuMemoryBufferCallback& callback) {
   DCHECK(CalledOnValidThread());
-  return gpu_memory_buffer_factory_->CreateGpuMemoryBuffer(
-      id, size, format, usage, client_id, surface_handle);
+  callback.Run(gpu_memory_buffer_factory_->CreateGpuMemoryBuffer(
+      id, size, format, usage, client_id, surface_handle));
 }
 
 void GpuServiceInternal::DestroyGpuMemoryBuffer(