Add initial test and build files for Robolectric unit test suites.

content/public/android/BUILD.gn

 # Copyright 2014 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/config.gni")
 import("//build/config/android/rules.gni")
 
 content_jni_gypi_values = exec_script("//build/gypi_to_gn.py",
                                       [ rebase_path("../../content_jni.gypi") ],
                                       "scope",
@@ skipping 160 matching lines @@
     "//net/android:net_java_test_support",
     "//third_party/mojo/src/mojo/public/interfaces/bindings/tests:test_interfaces_java",
     "//third_party/mojo/src/mojo/public/java:bindings",
     "//third_party/mojo/src/mojo/public/java:system",
     "//ui/android:ui_java",
     ":content_java",
   ]
 
   DEPRECATED_java_in_dir = "javatests/src"
 }
+
+# GYP: //content/content_tests.gypi:content_shell_unit_tests
+java_binary("chrome_shell_unit_tests") {
+  testonly = true
+  java_files = [ "junit/src/org/chromium/content/browser/input/GamepadMappingsTest.java" ]
+  main_class = "org.chromium.testing.local.JunitTestMain"
+  deps = [
+    ":content_java",
+    "//base:base_java",
+    "//base:base_java_test_support",
+    "//testing/android/junit:junit_test_support",
+  ]
+}
 # TODO(GYP): content_icudata