Fixed compilation errors in vulkan_renderer.h with enable_vulkan Flag.

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 5caa02ee100e7951e5d84aef343ef8877adf9e98..acd2532a4b5c9738d911d7ef15b0d42734794140 100644
--- a/cc/output/vulkan_renderer.cc
+++ b/cc/output/vulkan_renderer.cc
@@ -8,13 +8,10 @@ namespace cc {
 
 VulkanRenderer::~VulkanRenderer() {}
 
-void VulkanRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
-  CompositorFrame* compositor_frame = nullptr;
-  output_surface_->SwapBuffers(compositor_frame);
-}
-
-void VulkanRenderer::ReceiveSwapBuffersAck(const CompositorFrameAck& ack) {
-  NOTIMPLEMENTED();
+void VulkanRenderer::SwapBuffers(CompositorFrameMetadata metadata) {
+  CompositorFrame compositor_frame;
+  compositor_frame.metadata = std::move(metadata);
+  output_surface_->SwapBuffers(std::move(compositor_frame));
 }
 
 VulkanRenderer::VulkanRenderer(const RendererSettings* settings,
@@ -80,18 +77,15 @@ void VulkanRenderer::EnsureScissorTestDisabled() {
   NOTIMPLEMENTED();
 }
 
-void VulkanRenderer::DiscardBackbuffer() {
-  NOTIMPLEMENTED();
-}
-
-void VulkanRenderer::EnsureBackbuffer() {
-  NOTIMPLEMENTED();
-}
-
 void VulkanRenderer::CopyCurrentRenderPassToBitmap(
     DrawingFrame* frame,
     std::unique_ptr<CopyOutputRequest> request) {
   NOTIMPLEMENTED();
 }
 
+bool VulkanRenderer::CanPartialSwap() {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 }  // namespace cc