Expose android_cpu to Skylark.

RELNOTES: none
PiperOrigin-RevId: 210193095
diff --git a/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/android/AndroidConfigurationApi.java b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/android/AndroidConfigurationApi.java
index 48b65d7..e7d4318 100644
--- a/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/android/AndroidConfigurationApi.java
+++ b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/android/AndroidConfigurationApi.java
@@ -13,6 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.lib.skylarkbuildapi.android;
 
+import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
 import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
 import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory;
 
@@ -25,4 +26,12 @@
             + "A configuration fragment for Android.",
     documented = false,
     category = SkylarkModuleCategory.CONFIGURATION_FRAGMENT)
-public interface AndroidConfigurationApi {}
+public interface AndroidConfigurationApi {
+
+  @SkylarkCallable(
+      name = "android_cpu",
+      structField = true,
+      doc = "The Android target CPU.",
+      documented = false)
+  String getCpu();
+}