Define a Java-side global application context.

base/android/context_utils.cc

Index: base/android/context_utils.cc
diff --git a/base/android/context_utils.cc b/base/android/context_utils.cc
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+++ b/base/android/context_utils.cc
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+// Copyright 2015 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/context_utils.h"
+
+#include <jni.h>
+
+#include "base/lazy_instance.h"
+#include "jni/ContextUtils_jni.h"
+
+namespace base {
+namespace android {
+
+namespace {
+
+// Leak the global app context, as it is used from a non-joinable worker thread
+// that may still be running at shutdown. There is no harm in doing this.
+base::LazyInstance<base::android::ScopedJavaGlobalRef<jobject> >::Leaky
+    g_application_context = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+const jobject GetApplicationContext() {
+  DCHECK(!g_application_context.Get().is_null());
+  return g_application_context.Get().obj();
+}
+
+static void InitApplicationContext(JNIEnv* env,
+                                   const JavaParamRef<jclass>& clazz,
+                                   const JavaParamRef<jobject>& context) {
+  if (env->IsSameObject(g_application_context.Get().obj(), context.obj())) {
+    // It's safe to set the context more than once if it's the same context.
+    return;
+  }
+  DCHECK(g_application_context.Get().is_null());
+  g_application_context.Get().Reset(context);
+}
+
+bool RegisterContextUtils(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace android
+}  // namespace base