GN/Win: Vulkan support, convert -Vulkan bots.

CQ_INCLUDE_TRYBOTS=master.client.skia.compile:Build-Win-MSVC-x86_64-Release-Vulkan-Trybot;master.client.skia:Test-Win10-MSVC-ShuttleA-GPU-GTX660-x86_64-Debug-Vulkan-Trybot,Perf-Win10-MSVC-ShuttleA-GPU-GTX660-x86_64-Release-Vulkan-Trybot,Perf-Win10-MSVC-ShuttleA-GPU-GTX660-x86_64-Debug-Vulkan-Trybot

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3421

Change-Id: I7012719fff66778488589ab9c15fd2fa2a109cd1
Reviewed-on: https://skia-review.googlesource.com/3421
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index e1f0fc8..14918da 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -118,10 +118,19 @@
   lib_dirs = []
   if (skia_use_vulkan) {
     if (skia_vulkan_sdk != "") {
-      include_dirs += [ "$skia_vulkan_sdk/x86_64/include/" ]
-      lib_dirs += [ "$skia_vulkan_sdk/x86_64/lib/" ]
+      if (is_win) {
+        include_dirs += [ "$skia_vulkan_sdk/Include/" ]
+        lib_dirs += [ "$skia_vulkan_sdk/Bin" ]
+      } else {
+        include_dirs += [ "$skia_vulkan_sdk/x86_64/include/" ]
+        lib_dirs += [ "$skia_vulkan_sdk/x86_64/lib/" ]
+      }
     }
-    libs += [ "vulkan" ]
+    if (is_win) {
+      libs += [ "vulkan-1.lib" ]
+    } else {
+      libs += [ "vulkan" ]
+    }
   }
 }