Run the java formatter more than once. (#163)

The java formatter is rules based and the output from the first pass is
not guarantee to pass linting yet. For example, if unused imports are
removed, it may not clean up double line break whitespace.

synthtool/languages/java.py

@@ -24,7 +24,9 @@
 DEFAULT_FORMAT_VERSION = "1.6"
 
 
-def format_code(path: str, version: str = DEFAULT_FORMAT_VERSION) -> None:
+def format_code(
+    path: str, version: str = DEFAULT_FORMAT_VERSION, times: int = 2
+) -> None:
     """
     Runs the google-java-format jar against all .java files found within the
     provided path.
@@ -39,7 +41,8 @@ def format_code(path: str, version: str = DEFAULT_FORMAT_VERSION) -> None:
 
     # Run the formatter as a jar file
     log.info("Running java formatter on {} files".format(len(files)))
-    shell.run(["java", "-jar", str(jar), "--replace"] + files)
+    for _ in range(times):
+        shell.run(["java", "-jar", str(jar), "--replace"] + files)
 
 
 def _download_formatter(version: str, dest: Path) -> None: