Need to call RegisterJni for testing.

media/base/media_android.cc

 // Copyright 2013 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.
 
 #include "media/base/media.h"
 
 #include <cpu-features.h>
 
+#include "base/android/jni_android.h"
 #include "base/logging.h"
+#include "media/base/android/media_jni_registrar.h"
 
 namespace media {
 
 // Caches the result of the check for NEON support.
 static bool g_media_library_is_initialized = false;
 
 bool InitializeMediaLibrary(const base::FilePath& module_dir) {
   // No real initialization is necessary but we do need to check if
   // Neon is supported because the FFT library requires Neon.
   g_media_library_is_initialized = (android_getCpuFeatures() &
                                     ANDROID_CPU_ARM_FEATURE_NEON) != 0;
   return g_media_library_is_initialized;
 }
 
 void InitializeMediaLibraryForTesting() {
+  // Register JNI bindings for android.
+  JNIEnv* env = base::android::AttachCurrentThread();
+  RegisterJni(env);
 }
 
 bool IsMediaLibraryInitialized() {
   return g_media_library_is_initialized;
 }
 
 }  // namespace media