Make OffscreenCanvas animation in sync with its placeholder canvas's parent frame rate

content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc

 // Copyright (c) 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.
 
 #include "content/browser/compositor/test/no_transport_image_transport_factory.h"
 #include "content/browser/renderer_host/offscreen_canvas_surface_impl.h"
 #include "content/browser/renderer_host/offscreen_canvas_surface_manager.h"
 #include "content/public/test/test_browser_thread.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 57 matching lines @@
 // This test mimics the workflow of OffscreenCanvas.commit() on renderer
 // process.
 TEST_F(OffscreenCanvasSurfaceManagerTest,
        SingleHTMLCanvasElementTransferToOffscreen) {
   blink::mojom::OffscreenCanvasSurfaceClientPtr client;
   cc::FrameSinkId frame_sink_id(3, 3);
   cc::SurfaceIdAllocator surface_id_allocator;
   cc::LocalSurfaceId current_local_surface_id(
       surface_id_allocator.GenerateId());
 
-  auto surface_impl = base::WrapUnique(
-      new OffscreenCanvasSurfaceImpl(frame_sink_id, std::move(client)));
+  auto surface_impl = base::WrapUnique(new OffscreenCanvasSurfaceImpl(
+      cc::FrameSinkId(), frame_sink_id, std::move(client)));
   EXPECT_EQ(1, this->getNumSurfaceImplInstances());
   EXPECT_EQ(surface_impl.get(),
             OffscreenCanvasSurfaceManager::GetInstance()->GetSurfaceInstance(
                 frame_sink_id));
 
   this->OnSurfaceCreated(
       cc::SurfaceId(frame_sink_id, current_local_surface_id));
   EXPECT_EQ(current_local_surface_id, surface_impl->current_local_surface_id());
 
   surface_impl = nullptr;
   EXPECT_EQ(0, this->getNumSurfaceImplInstances());
 }
 
 TEST_F(OffscreenCanvasSurfaceManagerTest,
        MultiHTMLCanvasElementTransferToOffscreen) {
   blink::mojom::OffscreenCanvasSurfaceClientPtr client_a;
+  cc::FrameSinkId dummy_parent_frame_sink_id(0, 0);
   cc::FrameSinkId frame_sink_id_a(3, 3);
   cc::SurfaceIdAllocator surface_id_allocator;
-  auto surface_impl_a = base::WrapUnique(
-      new OffscreenCanvasSurfaceImpl(frame_sink_id_a, std::move(client_a)));
+  auto surface_impl_a = base::WrapUnique(new OffscreenCanvasSurfaceImpl(
+      dummy_parent_frame_sink_id, frame_sink_id_a, std::move(client_a)));
 
   blink::mojom::OffscreenCanvasSurfaceClientPtr client_b;
   cc::FrameSinkId frame_sink_id_b(4, 4);
 
-  auto surface_impl_b = base::WrapUnique(
-      new OffscreenCanvasSurfaceImpl(frame_sink_id_b, std::move(client_b)));
+  auto surface_impl_b = base::WrapUnique(new OffscreenCanvasSurfaceImpl(
+      dummy_parent_frame_sink_id, frame_sink_id_b, std::move(client_b)));
 
   EXPECT_EQ(2, this->getNumSurfaceImplInstances());
   EXPECT_EQ(surface_impl_a.get(),
             OffscreenCanvasSurfaceManager::GetInstance()->GetSurfaceInstance(
                 frame_sink_id_a));
   EXPECT_EQ(surface_impl_b.get(),
             OffscreenCanvasSurfaceManager::GetInstance()->GetSurfaceInstance(
                 frame_sink_id_b));
 
   surface_impl_a = nullptr;
   EXPECT_EQ(1, this->getNumSurfaceImplInstances());
   surface_impl_b = nullptr;
   EXPECT_EQ(0, this->getNumSurfaceImplInstances());
 }
 
 }  // namespace content