jni_generator: Always generate native exports.

base/android/jni_generator/testMultipleJNIAdditionalImport.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/foo/Foo
 
 #ifndef org_chromium_foo_Foo_JNI
 #define org_chromium_foo_Foo_JNI
 
 #include <jni.h>
 
 #include "base/android/jni_generator/jni_generator_helper.h"
 
 #include "base/android/jni_int_wrapper.h"
 
 // Step 1: forward declarations.
 namespace {
 const char kFooClassPath[] = "org/chromium/foo/Foo";
 // Leaking this jclass as we cannot use LazyInstance from some threads.
-jclass g_Foo_clazz = NULL;
-#define Foo_clazz(env) g_Foo_clazz
+base::subtle::AtomicWord g_Foo_clazz __attribute__((unused)) = 0;
+#define Foo_clazz(env) base::android::LazyGetClass(env, kFooClassPath, &g_Foo_clazz)
 
 }  // namespace
 
 // Step 2: method stubs.
 
 static void DoSomething(JNIEnv* env, const JavaParamRef<jclass>& jcaller,
     const JavaParamRef<jobject>& callback1,
     const JavaParamRef<jobject>& callback2);
 
-static void Java_org_chromium_foo_Foo_nativeDoSomething(JNIEnv* env, jclass
-    jcaller,
+extern "C" __attribute__((visibility("default")))
+void Java_org_chromium_foo_Foo_nativeDoSomething(JNIEnv* env, jclass jcaller,
     jobject callback1,
     jobject callback2) {
   return DoSomething(env, JavaParamRef<jclass>(env, jcaller),
       JavaParamRef<jobject>(env, callback1), JavaParamRef<jobject>(env,
       callback2));
 }
 
 static base::subtle::AtomicWord g_Foo_calledByNative = 0;
 static void Java_Foo_calledByNative(JNIEnv* env, jobject callback1,
     jobject callback2) {
@@ skipping 24 matching lines @@
 static const JNINativeMethod kMethodsFoo[] = {
     { "nativeDoSomething",
 "("
 "Lorg/chromium/foo/Bar1$Callback;"
 "Lorg/chromium/foo/Bar2$Callback;"
 ")"
 "V", reinterpret_cast<void*>(Java_org_chromium_foo_Foo_nativeDoSomething) },
 };
 
 static bool RegisterNativesImpl(JNIEnv* env) {
-
-  g_Foo_clazz = reinterpret_cast<jclass>(env->NewGlobalRef(
-      base::android::GetClass(env, kFooClassPath).obj()));
+  if (base::android::IsManualJniRegistrationDisabled()) return true;
 
   const int kMethodsFooSize = arraysize(kMethodsFoo);
 
   if (env->RegisterNatives(Foo_clazz(env),
                            kMethodsFoo,
                            kMethodsFooSize) < 0) {
     jni_generator::HandleRegistrationError(
         env, Foo_clazz(env), __FILE__);
     return false;
   }
 
   return true;
 }
 
 #endif  // org_chromium_foo_Foo_JNI