Make class lookup lazy in jni_generator when using lazy method lookup.

base/android/jni_generator/testPureNativeMethodsOption.golden

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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/Test
 
 #ifndef org_chromium_example_jni_generator_Test_JNI
 #define org_chromium_example_jni_generator_Test_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 kTestClassPath[] = "org/chromium/example/jni_generator/Test";
+#if __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+#endif
 // Leaking this jclass as we cannot use LazyInstance from some threads.
 jclass g_Test_clazz = NULL;
+jclass Test_clazz(JNIEnv*) { return g_Test_clazz; }
+#if __clang__
+#pragma clang diagnostic pop
+#endif
 
 }  // namespace
 
 // Step 2: method stubs.
 static jlong Method(JNIEnv* env, jobject jcaller,
     jlong nativeTest,
     jint arg1) {
   Test* native = reinterpret_cast<Test*>(nativeTest);
   CHECK_NATIVE_PTR(env, jcaller, native, "Method", 0);
   return native->Method(arg1);
 }
 
 // Step 3: RegisterNatives.
 
 static const JNINativeMethod kMethodsTest[] = {
     { "nativeMethod",
 "("
 "J"
 "I"
 ")"
 "J", reinterpret_cast<void*>(Method) },
 };
 
 static bool RegisterNativesImpl(JNIEnv* env) {
   g_Test_clazz = reinterpret_cast<jclass>(env->NewGlobalRef(
       base::android::GetClass(env, kTestClassPath).obj()));
 
   const int kMethodsTestSize = arraysize(kMethodsTest);
 
-  if (env->RegisterNatives(g_Test_clazz,
+  if (env->RegisterNatives(Test_clazz(env),
                            kMethodsTest,
                            kMethodsTestSize) < 0) {
     jni_generator::HandleRegistrationError(
-        env, g_Test_clazz, __FILE__);
+        env, Test_clazz(env), __FILE__);
     return false;
   }
 
   return true;
 }
 
 #endif  // org_chromium_example_jni_generator_Test_JNI