Add global and per-WebContents java InterfaceRegistries.

content/browser/android/java_interfaces_impl.cc

+// Copyright 2016 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 "content/browser/android/java_interfaces_impl.h"
+
+#include <jni.h>
+
+#include <utility>
+
+#include "base/android/context_utils.h"
+#include "base/android/jni_android.h"
+#include "base/memory/singleton.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "jni/InterfaceRegistrarImpl_jni.h"
+#include "mojo/public/cpp/system/message_pipe.h"
+#include "services/shell/public/cpp/interface_provider.h"
+
+namespace content {
+
+namespace {
+
+class JavaInterfaceProviderHolder {
+ public:
+  JavaInterfaceProviderHolder() {
+    shell::mojom::InterfaceProviderPtr provider;
+    JNIEnv* env = base::android::AttachCurrentThread();
+    Java_InterfaceRegistrarImpl_createInterfaceRegistryForContext(
+        env, mojo::GetProxy(&provider).PassMessagePipe().release().value(),
+        base::android::GetApplicationContext());
+    interface_provider_.Bind(std::move(provider));
+  }
+
+  static JavaInterfaceProviderHolder* GetInstance() {
+    DCHECK_CURRENTLY_ON(BrowserThread::UI);
+    return base::Singleton<JavaInterfaceProviderHolder>::get();
+  }
+
+  shell::InterfaceProvider* GetJavaInterfaces() { return &interface_provider_; }
+
+ private:
+  shell::InterfaceProvider interface_provider_;
+};
+
+}  // namespace
+
+shell::InterfaceProvider* GetGlobalJavaInterfaces() {
+  return JavaInterfaceProviderHolder::GetInstance()->GetJavaInterfaces();
+}
+
+void BindInterfaceRegistryForWebContents(
+    shell::mojom::InterfaceProviderRequest request,
+    WebContents* web_contents) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_InterfaceRegistrarImpl_createInterfaceRegistryForWebContents(
+      env, request.PassMessagePipe().release().value(),
+      web_contents->GetJavaWebContents().obj());
+}
+
+}  // namespace content