cc: Introduce BeginFrame sequence numbers and acknowledgements.

cc/output/vulkan_renderer.cc

Index: cc/output/vulkan_renderer.cc
diff --git a/cc/output/vulkan_renderer.cc b/cc/output/vulkan_renderer.cc
index 79ccf3b2e6b7ea968c206ea46062026c7f908cfe..76a546264dab799ef6b2e915394ee49694f788a3 100644
--- a/cc/output/vulkan_renderer.cc
+++ b/cc/output/vulkan_renderer.cc
@@ -9,9 +9,7 @@ namespace cc {
 
 VulkanRenderer::~VulkanRenderer() {}
 
-void VulkanRenderer::SwapBuffers(std::vector<ui::LatencyInfo> latency_info) {
-  OutputSurfaceFrame output_frame;
-  output_frame.latency_info = std::move(latency_info);
+void VulkanRenderer::SwapBuffers(OutputSurfaceFrame output_frame) {
   output_surface_->SwapBuffers(std::move(output_frame));
 }