gn2bp: Add _sanitize_args to JavaCppStringSanitizer

Test: m cronet_aml_base_java_switches_srcjar
Change-Id: I02c1d68aa824352cecb88c105a1dda990a5d17de
diff --git a/Android.bp.swp b/Android.bp.swp
index 7c65a94..62e32a1 100644
--- a/Android.bp.swp
+++ b/Android.bp.swp
@@ -4266,10 +4266,10 @@
         "base/base_switches.cc",
     ],
     cmd: "$(location build/android/gyp/java_cpp_strings.py) --srcjar " +
-         "gen/base/java_switches_srcjar.srcjar " +
+         "$(out) " +
          "--template " +
-         "../../base/android/java/src/org/chromium/base/BaseSwitches.java.tmpl " +
-         "../../base/base_switches.cc",
+         "$(location base/android/java/src/org/chromium/base/BaseSwitches.java.tmpl) " +
+         "$(location base/base_switches.cc)",
     out: [
         "base/java_switches_srcjar.srcjar",
     ],
diff --git a/gen_android_bp b/gen_android_bp
index e04172e..45edbb0 100755
--- a/gen_android_bp
+++ b/gen_android_bp
@@ -908,7 +908,10 @@
     super()._sanitize_args()
 
 class JavaCppStringSanitizer(BaseActionSanitizer):
-  pass
+  def _sanitize_args(self):
+    self._update_all_args(self._sanitize_filepath_with_location_tag)
+    self._set_value_arg('--srcjar', '$(out)')
+    super()._sanitize_args()
 
 def get_action_sanitizer(target, type):
   if target.script == "//build/write_buildflag_header.py":