base: Add ScopedJavaLocalFrame class.

base/android/scoped_java_ref.cc

 // Copyright (c) 2012 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 "base/android/scoped_java_ref.h"
 
 #include "base/android/jni_android.h"
 #include "base/logging.h"
 
 namespace base {
 namespace android {
+namespace {
+
+const int kDefaultLocalFrameCapacity = 512;
+
+}  // namespace
 
 JavaRef<jobject>::JavaRef() : obj_(NULL) {}
 
 JavaRef<jobject>::JavaRef(JNIEnv* env, jobject obj) : obj_(obj) {
   if (obj) {
     DCHECK(env && env->GetObjectRefType(obj) == JNILocalRefType);
   }
 }
 
 JavaRef<jobject>::~JavaRef() {
@@ skipping 40 matching lines @@
     obj_ = NULL;
   }
 }
 
 jobject JavaRef<jobject>::ReleaseInternal() {
   jobject obj = obj_;
   obj_ = NULL;
   return obj;
 }
 
+ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env) : env_(env) {
+  env_->PushLocalFrame(kDefaultLocalFrameCapacity);
+}
+
+ScopedJavaLocalFrame::ScopedJavaLocalFrame(JNIEnv* env, int capacity)
+    : env_(env) {
+  env_->PushLocalFrame(capacity);

[no sievers, 2014/04/04 20:32:11]

Might want to DCHECK() that this returns 0, esp. if you take user values here.

[reveman, 2014/04/04 21:07:08]

Done.

+}
+
+ScopedJavaLocalFrame::~ScopedJavaLocalFrame() { env_->PopLocalFrame(NULL); }
+
 }  // namespace android
 }  // namespace base