Add a way for JNI registrars to specify methods to be registered for tests.

base/android/jni_registrar.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_ANDROID_JNI_REGISTRAR_H_
 #define BASE_ANDROID_JNI_REGISTRAR_H_
 
 #include <jni.h>
+#include "base/android/jni_android.h"
 #include "base/basictypes.h"
 
 namespace base {
 namespace android {
 
-struct RegistrationMethod;
-
 // Registers the JNI bindings for the specified |method| definition containing
 // |count| elements.  Returns whether the registration of the given methods
 // succeeded.
 bool RegisterNativeMethods(JNIEnv* env,
                            const RegistrationMethod* method,
                            size_t count);
 
+bool RegisterAllNativeMethodsForTest(JNIEnv* env);
+
+// Helper class to append RegistrationMethods to a global list.
+// Used by the ADD_JNI_REGISTRATION_METHODS_FOR_TESTS macro.
+class AppendRegistrationMethods {
+ public:
+  AppendRegistrationMethods(const RegistrationMethod* methods, size_t count);
+};
+
+// This macro creates a AppendMultiProcessTest object whose constructor
+// does the work of adding to the global registration list.
+#define ADD_JNI_REGISTRATION_METHODS_FOR_TESTS(methods) \
+  namespace { \
+    base::android::AppendRegistrationMethods \
+    registration_methods(methods, arraysize(methods)); \
+  }
+
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_JNI_REGISTRAR_H_