Add jvm args option.  I rather not hardcode some large value just for Volantis.  This can easily be passed in from sign-build.sh and should be a no-op for any other tools

Bug: 17393134
Change-Id: Ic2325d7c1e1e7292c9339e169efbed526f82263c
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 83cda63..ffb6e39 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -46,6 +46,7 @@
 OPTIONS.signapk_path = "framework/signapk.jar"  # Relative to search_path
 OPTIONS.extra_signapk_args = []
 OPTIONS.java_path = "java"  # Use the one on the path by default.
+OPTIONS.java_args = "-Xmx2048m" # JVM Args
 OPTIONS.public_key_suffix = ".x509.pem"
 OPTIONS.private_key_suffix = ".pk8"
 OPTIONS.verbose = False
@@ -487,7 +488,7 @@
   else:
     sign_name = output_name
 
-  cmd = [OPTIONS.java_path, "-Xmx2048m", "-jar",
+  cmd = [OPTIONS.java_path, OPTIONS.java_args, "-jar",
          os.path.join(OPTIONS.search_path, OPTIONS.signapk_path)]
   cmd.extend(OPTIONS.extra_signapk_args)
   if whole_file:
@@ -635,6 +636,8 @@
       OPTIONS.extra_signapk_args = shlex.split(a)
     elif o in ("--java_path",):
       OPTIONS.java_path = a
+    elif o in ("--java_args",):
+      OPTIONS.java_args = a
     elif o in ("--public_key_suffix",):
       OPTIONS.public_key_suffix = a
     elif o in ("--private_key_suffix",):