[Android] Add ChromiumNetTestSupport.apk for the java EmbeddedTestServer.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index e9bc061eb491f78fc54e70d776d60f71a3f05602..855594b8b9342d4674c061e774968d86314d591e 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1687,7 +1687,10 @@ if (is_android) {
       ":base_java",
       "//testing/android/reporter:reporter_java",
     ]
+    srcjar_deps = [ ":base_native_test_libraries_gen" ]
     DEPRECATED_java_in_dir = "test/android/javatests/src"
+
+    jar_excluded_patterns = [ "*/NativeTestLibraries.class" ]
   }
 
   # TODO(jbudorick): Remove this once we roll to robolectric 3.0 and pull
@@ -1748,6 +1751,14 @@ if (is_android) {
     package_name = "org/chromium/base/library_loader"
   }
 
+  # GYP: //base/base.gyp:base_native_test_libraries_gen
+  java_cpp_template("base_native_test_libraries_gen") {
+    sources = [
+      "test/android/java/templates/NativeTestLibraries.template",
+    ]
+    package_name = "org/chromium/base/test/library_loader"
+  }
+
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [