Eliminate usage of InterfacePtr::WaitForIncomingResponse.

services/ui/public/interfaces/command_buffer.mojom

 // 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.
 
 module ui.mojom;
 
 import "gpu/ipc/common/capabilities.mojom";
 import "gpu/ipc/common/command_buffer.mojom";
 import "gpu/ipc/common/mailbox.mojom";
 import "gpu/ipc/common/sync_token.mojom";
@@ skipping 15 matching lines @@
   UpdateState(gpu.mojom.CommandBufferState state);
   // TODO(penghuang): use base::TimeTicks & base::TimeDelta.
   UpdateVSyncParameters(int64 timebase, int64 interval);
 };
 
 interface CommandBuffer {
   // Initialize attempts to initialize the command buffer.
   // If the context is lost after creation the LostContext method on the
   // CommandBufferClient's will be called then this pipe will be
   // closed.
+  [Sync]
   Initialize(CommandBufferClient client,
              handle<shared_buffer> shared_state,
              array<int32> attribs) => (CommandBufferInitializeResult? result);
   SetGetBuffer(int32 buffer);
   Flush(int32 put_offset);
+  [Sync]
   MakeProgress(int32 last_get_offset) => (gpu.mojom.CommandBufferState state);
   RegisterTransferBuffer(
       int32 id, handle<shared_buffer> transfer_buffer, uint32 size);
   DestroyTransferBuffer(int32 id);
   CreateImage(int32 id,
               handle memory_handle,
               int32 type,
               gfx.mojom.Size size,
               int32 format,
               int32 internal_format);
   DestroyImage(int32 id);
   CreateStreamTexture(uint32 client_texture_id)
       => (int32 stream_id, bool succeeded);
   TakeFrontBuffer(gpu.mojom.Mailbox mailbox);
   ReturnFrontBuffer(gpu.mojom.Mailbox mailbox, bool is_lost);
   SignalQuery(uint32 query, uint32 signal_id);
   SignalSyncToken(gpu.mojom.SyncToken sync_token, uint32 signal_id);
   WaitForGetOffsetInRange(int32 start, int32 end)
       => (gpu.mojom.CommandBufferState state);
   WaitForTokenInRange(int32 start, int32 end)
       => (gpu.mojom.CommandBufferState state);
 };