gpu: Add mojom for GpuPreferences.

gpu/ipc/common/traits_test_service.mojom

 // Copyright 2016 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.
 
 module gpu.mojom;
 
 import "gpu/ipc/common/dx_diag_node.mojom";
 import "gpu/ipc/common/gpu_info.mojom";
+import "gpu/ipc/common/gpu_preferences.mojom";
 import "gpu/ipc/common/mailbox.mojom";
 import "gpu/ipc/common/mailbox_holder.mojom";
 import "gpu/ipc/common/sync_token.mojom";
 
 // All functions on this interface echo their arguments to test StructTraits
 // serialization and deserialization.
 interface TraitsTestService {
 
   [Sync]
   EchoDxDiagNode(DxDiagNode d) => (DxDiagNode pass);
@@ skipping 20 matching lines @@
 
   [Sync]
   EchoVideoDecodeAcceleratorCapabilities(
     VideoDecodeAcceleratorCapabilities v) =>
       (VideoDecodeAcceleratorCapabilities pass);
 
   [Sync]
   EchoVideoEncodeAcceleratorSupportedProfile(
     VideoEncodeAcceleratorSupportedProfile v) =>
       (VideoEncodeAcceleratorSupportedProfile pass);
+
+  [Sync]
+  EchoGpuPreferences(GpuPreferences prefs) => (GpuPreferences pass);
 };