Add API defintions for VK_KHR_incremental_present.

The actual functionality for this extension was already implemented, but these
"boilerplate" changes were missed.

Test: Manually tested with the cube demo.

Change-Id: Ica3ee5b7d9255c6067afa0301bc5e2fa14cfc7ae
diff --git a/vulkan/libvulkan/code-generator.tmpl b/vulkan/libvulkan/code-generator.tmpl
index c6d485a..b27b36c 100644
--- a/vulkan/libvulkan/code-generator.tmpl
+++ b/vulkan/libvulkan/code-generator.tmpl
@@ -697,6 +697,7 @@
 VK_ANDROID_native_buffer
 VK_EXT_debug_report
 VK_KHR_android_surface
+VK_KHR_incremental_present
 VK_KHR_surface
 VK_KHR_swapchain
 {{end}}
@@ -1145,6 +1146,7 @@
   {{     if eq $ext "VK_KHR_surface"}}true
   {{else if eq $ext "VK_KHR_swapchain"}}true
   {{else if eq $ext "VK_KHR_android_surface"}}true
+  {{else if eq $ext "VK_KHR_incremental_present"}}true
   {{end}}
 {{end}}