[vulkan] make validation layer errors non-fatal on Fuchsia (flutter/engine#3674)

engine/src/flutter/vulkan/vulkan_debug_report.cc

@@ -201,7 +201,11 @@ OnVulkanDebugReportCallback(VkDebugReportFlagsEXT flags,
   stream << "-----------------------------------------------------------------";
 
   if (flags & kVulkanErrorFlags) {
-    FTL_DCHECK(false) << stream.str();
+    if (ValidationErrorsFatal()) {
+      FTL_DCHECK(false) << stream.str();
+    } else {
+      FTL_LOG(ERROR) << stream.str();
+    }
   } else {
     FTL_LOG(INFO) << stream.str();
   }

engine/src/flutter/vulkan/vulkan_utilities.cc

@@ -23,6 +23,14 @@ bool ValidationLayerInfoMessagesEnabled() {
   return false;
 }
 
+bool ValidationErrorsFatal() {
+#if OS_FUCHSIA
+  return false;
+#endif
+
+  return true;
+}
+
 static std::vector<std::string> InstanceOrDeviceLayersToEnable(
     const VulkanProcTable& vk,
     VkPhysicalDevice physical_device) {

engine/src/flutter/vulkan/vulkan_utilities.h

@@ -16,6 +16,7 @@ namespace vulkan {
 
 bool IsDebuggingEnabled();
 bool ValidationLayerInfoMessagesEnabled();
+bool ValidationErrorsFatal();
 
 std::vector<std::string> InstanceLayersToEnable(const VulkanProcTable& vk);