Added dummy definition for CanPartialSwap() in VulkanRenderer class

cc/output/vulkan_renderer.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 "cc/output/vulkan_renderer.h"
 
 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();
 }
 
+bool VulkanRenderer::CanPartialSwap() {
+   NOTIMPLEMENTED();
+   return true;
+}
+
 VulkanRenderer::VulkanRenderer(const RendererSettings* settings,
                                OutputSurface* output_surface,
                                ResourceProvider* resource_provider,
                                TextureMailboxDeleter* texture_mailbox_deleter,
                                int highp_threshold_min)
     : DirectRenderer(settings, output_surface, resource_provider) {}
 
 void VulkanRenderer::DidChangeVisibility() {
   NOTIMPLEMENTED();
 }
@@ skipping 58 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void VulkanRenderer::CopyCurrentRenderPassToBitmap(
     DrawingFrame* frame,
     std::unique_ptr<CopyOutputRequest> request) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace cc