Move Vulkan DebugCallback code into tools.

Bug: skia:
Change-Id: Ib356200e86e54f9ff0ba16396874e6fd10cf0465
Reviewed-on: https://skia-review.googlesource.com/137424
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tools/sk_app/VulkanWindowContext.cpp b/tools/sk_app/VulkanWindowContext.cpp
index 411f114..8e0749e 100644
--- a/tools/sk_app/VulkanWindowContext.cpp
+++ b/tools/sk_app/VulkanWindowContext.cpp
@@ -51,7 +51,8 @@
 
     GrVkBackendContext backendContext;
     if (!sk_gpu_test::CreateVkBackendContext(fGetInstanceProcAddr, fGetDeviceProcAddr,
-                                             &backendContext, &fPresentQueueIndex, fCanPresentFn)) {
+                                             &backendContext, &fDebugCallback,
+                                             &fPresentQueueIndex, fCanPresentFn)) {
         return;
     }
 
@@ -409,28 +410,26 @@
 }
 
 void VulkanWindowContext::destroyContext() {
-    if (!this->isValid()) {
-        return;
-    }
+    if (this->isValid()) {
+        fQueueWaitIdle(fPresentQueue);
+        fDeviceWaitIdle(fDevice);
 
-    fQueueWaitIdle(fPresentQueue);
-    fDeviceWaitIdle(fDevice);
+        this->destroyBuffers();
 
-    this->destroyBuffers();
+        if (VK_NULL_HANDLE != fCommandPool) {
+            GR_VK_CALL(fInterface, DestroyCommandPool(fDevice, fCommandPool, nullptr));
+            fCommandPool = VK_NULL_HANDLE;
+        }
 
-    if (VK_NULL_HANDLE != fCommandPool) {
-        GR_VK_CALL(fInterface, DestroyCommandPool(fDevice, fCommandPool, nullptr));
-        fCommandPool = VK_NULL_HANDLE;
-    }
+        if (VK_NULL_HANDLE != fSwapchain) {
+            fDestroySwapchainKHR(fDevice, fSwapchain, nullptr);
+            fSwapchain = VK_NULL_HANDLE;
+        }
 
-    if (VK_NULL_HANDLE != fSwapchain) {
-        fDestroySwapchainKHR(fDevice, fSwapchain, nullptr);
-        fSwapchain = VK_NULL_HANDLE;
-    }
-
-    if (VK_NULL_HANDLE != fSurface) {
-        fDestroySurfaceKHR(fInstance, fSurface, nullptr);
-        fSurface = VK_NULL_HANDLE;
+        if (VK_NULL_HANDLE != fSurface) {
+            fDestroySurfaceKHR(fInstance, fSurface, nullptr);
+            fSurface = VK_NULL_HANDLE;
+        }
     }
 
     fContext.reset();
@@ -440,6 +439,14 @@
         fDestroyDevice(fDevice, nullptr);
         fDevice = VK_NULL_HANDLE;
     }
+
+#ifdef SK_ENABLE_VK_LAYERS
+    if (fDebugCallback != VK_NULL_HANDLE) {
+        GR_VK_CALL(fInterface, DestroyDebugReportCallbackEXT(fInstance, fDebugCallback,
+                                                             nullptr));
+    }
+#endif
+
     fPhysicalDevice = VK_NULL_HANDLE;
 
     if (VK_NULL_HANDLE != fInstance) {