Add global and per-WebContents java InterfaceRegistries.

content/browser/android/java_interfaces_impl.h

+// 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.
+
+#ifndef CONTENT_BROWSER_ANDROID_JAVA_INTERFACES_IMPL_H_
+#define CONTENT_BROWSER_ANDROID_JAVA_INTERFACES_IMPL_H_
+
+#include "content/public/browser/android/java_interfaces.h"
+#include "services/shell/public/interfaces/interface_provider.mojom.h"
+
+namespace content {
+class WebContents;
+
+void BindInterfaceRegistryForWebContents(
+    shell::mojom::InterfaceProviderRequest request,
+    WebContents* web_contents);
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_JAVA_INTERFACES_IMPL_H_