Add a JSON sanitizer.

components/safe_json/android/BUILD.gn

Index: components/safe_json/android/BUILD.gn
diff --git a/components/safe_json/android/BUILD.gn b/components/safe_json/android/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..bfb462d4cdd5abd0cea823220898b4305768adcc
--- /dev/null
+++ b/components/safe_json/android/BUILD.gn
@@ -0,0 +1,22 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+
+_jni_sources =
+    [ "java/src/org/chromium/components/safejson/JsonSanitizer.java" ]
+
+# GYP: //components/safe_json.gypi:safe_json_jni_headers
+generate_jni("safe_json_jni_headers") {
+  sources = _jni_sources
+  jni_package = "safe_json"
+}
+
+# GYP: //components/safe_json.gypi:safe_json_java
+android_library("safe_json_java") {
+  deps = [
+    "//base:base_java",
+  ]
+  java_files = [] + _jni_sources
+}