Rename java_prebuilt_library to java_import

And make it work like bazel's java_import, using a "jars" property
instead of "srcs", and allowing multiple jars to be listed.

Test: soong tests
Change-Id: Ida2ace6412bd77b4feb423646000a1401004e0ea
diff --git a/java/androidmk.go b/java/androidmk.go
index 9ccf856..92af0ed 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -15,17 +15,28 @@
 package java
 
 import (
+	"fmt"
+	"io"
+
 	"android/soong/android"
 )
 
 func (library *Library) AndroidMk() (ret android.AndroidMkData, err error) {
 	ret.Class = "JAVA_LIBRARIES"
 	ret.OutputFile = android.OptionalPathForPath(library.outputFile)
+	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) error {
+		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := .jar")
+		return nil
+	})
 	return
 }
 
-func (prebuilt *Prebuilt) AndroidMk() (ret android.AndroidMkData, err error) {
+func (prebuilt *Import) AndroidMk() (ret android.AndroidMkData, err error) {
 	ret.Class = "JAVA_LIBRARIES"
-	ret.OutputFile = android.OptionalPathForPath(prebuilt.classpathFile)
+	ret.OutputFile = android.OptionalPathForPath(prebuilt.combinedClasspathFile)
+	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) error {
+		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := .jar")
+		return nil
+	})
 	return
 }