sync compositor: Signal async frame on IO thread

content/public/test/test_synchronous_compositor_android.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/public/test/test_synchronous_compositor_android.h"
 
 #include <utility>
 
 #include "cc/output/compositor_frame.h"
 
@@ skipping 15 matching lines @@
     client_->DidInitializeCompositor(this, process_id_, routing_id_);
 }
 
 SynchronousCompositor::Frame TestSynchronousCompositor::DemandDrawHw(
     const gfx::Size& viewport_size,
     const gfx::Rect& viewport_rect_for_tile_priority,
     const gfx::Transform& transform_for_tile_priority) {
   return std::move(hardware_frame_);
 }
 
-void TestSynchronousCompositor::DemandDrawHwAsync(
+scoped_refptr<SynchronousCompositor::FrameFuture>
+TestSynchronousCompositor::DemandDrawHwAsync(
     const gfx::Size& viewport_size,
     const gfx::Rect& viewport_rect_for_tile_priority,
-    const gfx::Transform& transform_for_tile_priority) {}
+    const gfx::Transform& transform_for_tile_priority) {
+  return nullptr;
+}
 
 void TestSynchronousCompositor::ReturnResources(
     uint32_t compositor_frame_sink_id,
     const cc::ReturnedResourceArray& resources) {
   ReturnedResources returned_resources;
   returned_resources.compositor_frame_sink_id = compositor_frame_sink_id;
   returned_resources.resources = resources;
   frame_ack_array_.push_back(returned_resources);
 }
 
@@ skipping 16 matching lines @@
 
 TestSynchronousCompositor::ReturnedResources::ReturnedResources()
     : compositor_frame_sink_id(0u) {}
 
 TestSynchronousCompositor::ReturnedResources::ReturnedResources(
     const ReturnedResources& other) = default;
 
 TestSynchronousCompositor::ReturnedResources::~ReturnedResources() {}
 
 }  // namespace content