releasetools: Use java_path in sign_target_files_apks.py.

Prior to this CL, it was calling the hard-coded "java" although it was
accepting a "--java_path" option.

Also switch OPTIONS.java_args from string to list. Otherwise it won't
work when providing multiple args.

Bug: 32737832
Test: Specify "--java_path=" and "--java_args" when invoking
      sign_target_files_apks.py with "-v". Check the commands being
      called.
Change-Id: Id7ef98e778646d532027434de7fba9b7a104dbd0

tools/releasetools/common.py

@@ -46,7 +46,7 @@ class Options(object):
     self.signapk_shared_library_path = "lib64"   # Relative to search_path
     self.extra_signapk_args = []
     self.java_path = "java"  # Use the one on the path by default.
-    self.java_args = "-Xmx2048m" # JVM Args
+    self.java_args = ["-Xmx2048m"]  # The default JVM args.
     self.public_key_suffix = ".x509.pem"
     self.private_key_suffix = ".pk8"
     # use otatools built boot_signer by default
@@ -719,11 +719,10 @@ def SignFile(input_name, output_name, key, password, min_api_level=None,
   java_library_path = os.path.join(
       OPTIONS.search_path, OPTIONS.signapk_shared_library_path)
 
-  cmd = [OPTIONS.java_path, OPTIONS.java_args,
-         "-Djava.library.path=" + java_library_path,
-         "-jar",
-         os.path.join(OPTIONS.search_path, OPTIONS.signapk_path)]
-  cmd.extend(OPTIONS.extra_signapk_args)
+  cmd = ([OPTIONS.java_path] + OPTIONS.java_args +
+         ["-Djava.library.path=" + java_library_path,
+          "-jar", os.path.join(OPTIONS.search_path, OPTIONS.signapk_path)] +
+         OPTIONS.extra_signapk_args)
   if whole_file:
     cmd.append("-w")
 
@@ -875,7 +874,7 @@ def ParseOptions(argv,
     elif o in ("--java_path",):
       OPTIONS.java_path = a
     elif o in ("--java_args",):
-      OPTIONS.java_args = a
+      OPTIONS.java_args = shlex.split(a)
     elif o in ("--public_key_suffix",):
       OPTIONS.public_key_suffix = a
     elif o in ("--private_key_suffix",):