Android: Don't require RegisterNatives if there are none

base/android/jni_generator/testNativeExportsOnlyOption.golden

 // 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.
 
 // This file is autogenerated by
 //     base/android/jni_generator/jni_generator.py
 // For
 //     org/chromium/example/jni_generator/SampleForTests
 
 #ifndef org_chromium_example_jni_generator_SampleForTests_JNI
@@ skipping 54 matching lines @@
 extern "C" __attribute__((visibility("default")))
 jint
     Java_org_chromium_example_jni_1generator_SampleForTests_00024MyOtherInnerClass_nativeInit(JNIEnv*
     env, jobject jcaller) {
   return Init(env, JavaParamRef<jobject>(env, jcaller));
 }
 
 static base::subtle::AtomicWord g_SampleForTests_testMethodWithParam = 0;
 static void Java_SampleForTests_testMethodWithParam(JNIEnv* env, jobject obj,
     JniIntWrapper iParam) {
-  /* Must call RegisterNativesImpl()  */
   CHECK_CLAZZ(env, obj,
       SampleForTests_clazz(env));
   jmethodID method_id =
       base::android::MethodID::LazyGet<
       base::android::MethodID::TYPE_INSTANCE>(
       env, SampleForTests_clazz(env),
       "testMethodWithParam",
 
 "("
 "I"
 ")"
 "V",
       &g_SampleForTests_testMethodWithParam);
 
      env->CallVoidMethod(obj,
           method_id, as_jint(iParam));
   jni_generator::CheckException(env);
 
 }
 
 static base::subtle::AtomicWord g_SampleForTests_testMethodWithParamAndReturn =
     0;
 static ScopedJavaLocalRef<jstring>
     Java_SampleForTests_testMethodWithParamAndReturn(JNIEnv* env, jobject obj,
     JniIntWrapper iParam) {
-  /* Must call RegisterNativesImpl()  */
   CHECK_CLAZZ(env, obj,
       SampleForTests_clazz(env), NULL);
   jmethodID method_id =
       base::android::MethodID::LazyGet<
       base::android::MethodID::TYPE_INSTANCE>(
       env, SampleForTests_clazz(env),
       "testMethodWithParamAndReturn",
 
 "("
 "I"
 ")"
 "Ljava/lang/String;",
       &g_SampleForTests_testMethodWithParamAndReturn);
 
   jstring ret =
       static_cast<jstring>(env->CallObjectMethod(obj,
           method_id, as_jint(iParam)));
   jni_generator::CheckException(env);
   return ScopedJavaLocalRef<jstring>(env, ret);
 }
 
 static base::subtle::AtomicWord g_SampleForTests_testStaticMethodWithParam = 0;
 static jint Java_SampleForTests_testStaticMethodWithParam(JNIEnv* env,
     JniIntWrapper iParam) {
-  /* Must call RegisterNativesImpl()  */
   CHECK_CLAZZ(env, SampleForTests_clazz(env),
       SampleForTests_clazz(env), 0);
   jmethodID method_id =
       base::android::MethodID::LazyGet<
       base::android::MethodID::TYPE_STATIC>(
       env, SampleForTests_clazz(env),
       "testStaticMethodWithParam",
 
 "("
 "I"
 ")"
 "I",
       &g_SampleForTests_testStaticMethodWithParam);
 
   jint ret =
       env->CallStaticIntMethod(SampleForTests_clazz(env),
           method_id, as_jint(iParam));
   jni_generator::CheckException(env);
   return ret;
 }
 
 static base::subtle::AtomicWord g_SampleForTests_testMethodWithNoParam = 0;
 static jdouble Java_SampleForTests_testMethodWithNoParam(JNIEnv* env) {
-  /* Must call RegisterNativesImpl()  */
   CHECK_CLAZZ(env, SampleForTests_clazz(env),
       SampleForTests_clazz(env), 0);
   jmethodID method_id =
       base::android::MethodID::LazyGet<
       base::android::MethodID::TYPE_STATIC>(
       env, SampleForTests_clazz(env),
       "testMethodWithNoParam",
 
 "("
 ")"
 "D",
       &g_SampleForTests_testMethodWithNoParam);
 
   jdouble ret =
       env->CallStaticDoubleMethod(SampleForTests_clazz(env),
           method_id);
   jni_generator::CheckException(env);
   return ret;
 }
 
 static base::subtle::AtomicWord g_SampleForTests_testStaticMethodWithNoParam =
     0;
 static ScopedJavaLocalRef<jstring>
     Java_SampleForTests_testStaticMethodWithNoParam(JNIEnv* env) {
-  /* Must call RegisterNativesImpl()  */
   CHECK_CLAZZ(env, SampleForTests_clazz(env),
       SampleForTests_clazz(env), NULL);
   jmethodID method_id =
       base::android::MethodID::LazyGet<
       base::android::MethodID::TYPE_STATIC>(
       env, SampleForTests_clazz(env),
       "testStaticMethodWithNoParam",
 
 "("
 ")"
 "Ljava/lang/String;",
       &g_SampleForTests_testStaticMethodWithNoParam);
 
   jstring ret =
 static_cast<jstring>(env->CallStaticObjectMethod(SampleForTests_clazz(env),
           method_id));
   jni_generator::CheckException(env);
   return ScopedJavaLocalRef<jstring>(env, ret);
 }
 
 // Step 3: RegisterNatives.
 
+static bool RegisterNativesImpl(JNIEnv* env) __attribute__((unused));
 static bool RegisterNativesImpl(JNIEnv* env) {
 
   return true;
 }
 
 #endif  // org_chromium_example_jni_generator_SampleForTests_JNI