`//src/test/java/com/google/devtools/build/lib/bazel:bazel-rules-tests` is failing. Please take a look at that. It's probably because the mocked NDK doesn't have these files..?
This is not a unique name, if `toolchain.getTargetCpu()` is common between the outer crosstools loop. Thanks for this, I've changed the rule name to contain the toolchain name, and it seems to have fixed the tests.
Android NDK package: add filegroup for Vulkan validation layers
### Description of the feature request:

Provide a mean to access Vulkan validation layers which are precompiled dynamic libraries shipped in Android NDK.

Android NDK BUILD file is generated by Bazel itself (`@androidndk`), and offers predefined rules/target related to the NDK. Currently, I cannot find an easy way to refer to the Vulkan validation layers. These layers are shipped in:

`$ANDROID_NDK_HOME/sources/third_party/vulkan/src/build-android/jniLibs/<ABI>/libVkLayer_*.so`

Where ABI is arm64-v8a, x86, etc.

### Feature requests: what underlying problem are you trying to solve with this feature?

Easily add Vulkan validation layers to Android app.

### Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

Try to refer to the Vulkan validation layers using Bazel. I think that currently you need a repository rule that can access ANDROID_NDK_HOME environment variable, and search for those layers yourself.

###  Have you found anything relevant by searching the web?

Nothing relevant shows up.

src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_build_file_template.txt
src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_build_file_template.txt src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_vulkan_validation_layers_template.txt
diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java
index dc33d59a0aa264..7c5cd30e452b2f 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/AndroidNdkRepositoryFunction.java
@@ -85,11 +85,13 @@ private static String createBuildFile(
     String ccToolchainSuiteTemplate = getTemplate("android_ndk_cc_toolchain_suite_template.txt");
     String ccToolchainTemplate = getTemplate("android_ndk_cc_toolchain_template.txt");
     String stlFilegroupTemplate = getTemplate("android_ndk_stl_filegroup_template.txt");
+    String vulkanValidationLayersTemplate = getTemplate("android_ndk_vulkan_validation_layers_template.txt");
     String miscLibrariesTemplate = getTemplate("android_ndk_misc_libraries_template.txt");
 
     StringBuilder ccToolchainSuites = new StringBuilder();
     StringBuilder ccToolchainRules = new StringBuilder();
     StringBuilder stlFilegroups = new StringBuilder();
+    StringBuilder vulkanValidationLayers = new StringBuilder();
     for (CrosstoolStlPair crosstoolStlPair : crosstools) {
 
       // Create the cc_toolchain_suite rule
@@ -131,6 +133,15 @@ private static String createBuildFile(
                 .replace("%name%", entry.getKey())
                 .replace("%fileGlobPattern%", entry.getValue()));
       }
+
+      // Create the Vulkan validation layers libraries
+      for (CToolchain toolchain : crosstool.getToolchainList()) {
+        vulkanValidationLayers.append(
+            vulkanValidationLayersTemplate
+                .replace("%toolchainName%", toolchain.getToolchainIdentifier())
+                .replace("%cpu%", toolchain.getTargetCpu()));
+      }
+
     }
 
     return buildFileTemplate
@@ -139,6 +150,7 @@ private static String createBuildFile(
         .replace("%ccToolchainSuites%", ccToolchainSuites)
         .replace("%ccToolchainRules%", ccToolchainRules)
         .replace("%stlFilegroups%", stlFilegroups)
+        .replace("%vulkanValidationLayers%", vulkanValidationLayers)
         .replace("%miscLibraries%", miscLibrariesTemplate);
   }
 
diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_build_file_template.txt b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_build_file_template.txt
index 0d0fbb45652c6f..b8e58e5d5a6262 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_build_file_template.txt
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_build_file_template.txt
@@ -52,6 +52,12 @@ alias(
 
 %stlFilegroups%
 
+################################################################
+# Vulkan validation layers libraries
+################################################################
+
+%vulkanValidationLayers%
+
 ################################################################
 # Miscellaneous runtime libraries
 ################################################################
diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_vulkan_validation_layers_template.txt b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_vulkan_validation_layers_template.txt
new file mode 100644
index 00000000000000..dd32111cb8f98e
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/android/android_ndk_vulkan_validation_layers_template.txt
@@ -0,0 +1,4 @@
+cc_library(
+    name = "vulkan_validation_layers_%toolchainName%",
+    srcs = glob(["ndk/sources/third_party/vulkan/src/build-android/jniLibs/%cpu%/libVkLayer_*.so"]),
+)
