Add missing #includes.

These headers are referenced without being directly #included. This was
noticed during a refactor.

Change-Id: I23420f1f2d02a428721b57d3195dae550effefa1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306319
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/tools/gpu/vk/VkTestUtils.cpp b/tools/gpu/vk/VkTestUtils.cpp
index 4a1f33d..bf06b1e 100644
--- a/tools/gpu/vk/VkTestUtils.cpp
+++ b/tools/gpu/vk/VkTestUtils.cpp
@@ -17,6 +17,8 @@
     #endif
 #endif
 
+#include <algorithm>
+
 #if defined(SK_BUILD_FOR_UNIX)
 #include <execinfo.h>
 #endif