tests: Enable all supportable features on the device; expose to tests.

Signed-off-by: Chris Forbes <chrisforbes@google.com>
diff --git a/tests/vktestbinding.h b/tests/vktestbinding.h
index 361c029..e22933e 100644
--- a/tests/vktestbinding.h
+++ b/tests/vktestbinding.h
@@ -124,6 +124,7 @@
     VkPhysicalDeviceProperties properties() const;
     VkPhysicalDeviceMemoryProperties memory_properties() const;
     std::vector<VkQueueFamilyProperties> queue_properties() const;
+    VkPhysicalDeviceFeatures features() const;
 
     bool set_memory_type(const uint32_t type_bits, VkMemoryAllocateInfo *info,
                          const VkMemoryPropertyFlags properties,