Add proguard.flags for missing guava dependencies.
Test: treehugger
PiperOrigin-RevId: 179434607
Change-Id: Ibed4fdf968f9341a18848cc0c5a5b0637f3cb03b
diff --git a/proguard.flags b/proguard.flags
new file mode 100644
index 0000000..160020b
--- /dev/null
+++ b/proguard.flags
@@ -0,0 +1,4 @@
+# These are referenced by com.google.common.util.concurrent and
+# com.google.errorprone.annotations but don't exist on Android.
+-dontwarn java.lang.ClassValue
+-dontwarn javax.lang.model.element.Modifier
\ No newline at end of file