Export proguard_dictionary for java_library modules

Move exporting LOCAL_SOONG_PROGUARD_DICT from AndroidLibrary
to Library so that it is exported for java_library modules.

Test: m checkbuild
Change-Id: I27ea08ad8ba9072d0648c141cdbaf447c5268f91
diff --git a/java/androidmk.go b/java/androidmk.go
index 304b1c4..095acd7 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -91,6 +91,10 @@
 					fmt.Fprintln(w, "LOCAL_ADDITIONAL_CHECKED_MODULE +=", strings.Join(library.additionalCheckedModules.Strings(), " "))
 				}
 
+				if library.proguardDictionary != nil {
+					fmt.Fprintln(w, "LOCAL_SOONG_PROGUARD_DICT :=", library.proguardDictionary.String())
+				}
+
 				// Temporary hack: export sources used to compile framework.jar to Make
 				// to be used for droiddoc
 				// TODO(ccross): remove this once droiddoc is in soong
@@ -373,9 +377,6 @@
 		if a.aarFile != nil {
 			fmt.Fprintln(w, "LOCAL_SOONG_AAR :=", a.aarFile.String())
 		}
-		if a.proguardDictionary != nil {
-			fmt.Fprintln(w, "LOCAL_SOONG_PROGUARD_DICT :=", a.proguardDictionary.String())
-		}
 
 		if a.Name() == "framework-res" {
 			fmt.Fprintln(w, "LOCAL_MODULE_PATH := $(TARGET_OUT_JAVA_LIBRARIES)")