Add JavaBoundObject

base/android/jni_android.cc

Index: base/android/jni_android.cc
diff --git a/base/android/jni_android.cc b/base/android/jni_android.cc
index 1dc02afb3b0543fce35b14fcf1fb4401109a4db9..e6d6e56c2677c29f046c600bc34b7f833b6b32a3 100644
--- a/base/android/jni_android.cc
+++ b/base/android/jni_android.cc
@@ -4,6 +4,7 @@
 
 #include "base/android/jni_android.h"
 
+#include "base/android/scoped_java_ref.h"
 #include "base/logging.h"
 
 namespace {
@@ -46,6 +47,12 @@ jobject GetApplicationContext() {
   return g_application_context;
 }
 
+MethodID::MethodID(JNIEnv* env, const char* class_name, const char* method,
+                   const char* jni_signature) {
+  ScopedJavaLocalRef<jclass> clazz(env, env->FindClass(class_name));
+  id_ = GetMethodID(env, clazz.obj(), method, jni_signature);
+}
+
 jmethodID GetMethodID(JNIEnv* env,
                       jclass clazz,
                       const char* const method,
@@ -66,6 +73,16 @@ jmethodID GetStaticMethodID(JNIEnv* env,
   return id;
 }
 
+jfieldID GetFieldID(JNIEnv* env,
+                    jclass clazz,
+                    const char* field,
+                    const char* jni_signature) {
+  jfieldID id = env->GetFieldID(clazz, field, jni_signature);
+  DCHECK(id) << field;
+  CheckException(env);
+  return id;
+}
+
 bool CheckException(JNIEnv* env) {
   if (env->ExceptionCheck() == JNI_FALSE)
     return false;