android: Realign stack pointer on JNI entry.

base/android/jni_generator/testNativesLong.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/TestJni
 
 #ifndef org_chromium_TestJni_JNI
 #define org_chromium_TestJni_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 kTestJniClassPath[] = "org/chromium/TestJni";
 // Leaking this jclass as we cannot use LazyInstance from some threads.
 base::subtle::AtomicWord g_TestJni_clazz __attribute__((unused)) = 0;
 #define TestJni_clazz(env) base::android::LazyGetClass(env, kTestJniClassPath, &g_TestJni_clazz)
 
 }  // namespace
 
 // Step 2: method stubs.
-extern "C" __attribute__((visibility("default")))
-void Java_org_chromium_TestJni_nativeDestroy(JNIEnv* env,
+JNI_GENERATOR_EXPORT void Java_org_chromium_TestJni_nativeDestroy(JNIEnv* env,
     jobject jcaller,
     jlong nativeChromeBrowserProvider) {
   ChromeBrowserProvider* native =
       reinterpret_cast<ChromeBrowserProvider*>(nativeChromeBrowserProvider);
   CHECK_NATIVE_PTR(env, jcaller, native, "Destroy");
   return native->Destroy(env, base::android::JavaParamRef<jobject>(env,
       jcaller));
 }
 
 // Step 3: RegisterNatives.
@@ skipping 16 matching lines @@
                            kMethodsTestJniSize) < 0) {
     jni_generator::HandleRegistrationError(
         env, TestJni_clazz(env), __FILE__);
     return false;
   }
 
   return true;
 }
 
 #endif  // org_chromium_TestJni_JNI