Added the Vulkan Context Provider implementation.

content/renderer/gpu/compositor_output_surface.cc

Index: content/renderer/gpu/compositor_output_surface.cc
diff --git a/content/renderer/gpu/compositor_output_surface.cc b/content/renderer/gpu/compositor_output_surface.cc
index 1bf5e8373dde87b445b4c416ba0aa1f6c8326ba0..6b6aca4d0a9a7d658a38205ac9051e081d344a6c 100644
--- a/content/renderer/gpu/compositor_output_surface.cc
+++ b/content/renderer/gpu/compositor_output_surface.cc
@@ -33,17 +33,13 @@ CompositorOutputSurface::CompositorOutputSurface(
     uint32_t output_surface_id,
     const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
     const scoped_refptr<ContextProviderCommandBuffer>& worker_context_provider,
-#if defined(ENABLE_VULKAN)
     const scoped_refptr<cc::VulkanContextProvider>& vulkan_context_provider,
-#endif
     std::unique_ptr<cc::SoftwareOutputDevice> software_device,
     scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue,
     bool use_swap_compositor_frame_message)
     : OutputSurface(context_provider,
                     worker_context_provider,
-#if defined(ENABLE_VULKAN)
                     vulkan_context_provider,
-#endif
                     std::move(software_device)),
       output_surface_id_(output_surface_id),
       use_swap_compositor_frame_message_(use_swap_compositor_frame_message),