Add global and per-WebContents java InterfaceRegistries.

content/public/browser/android/java_interfaces.h

Index: content/public/browser/android/java_interfaces.h
diff --git a/content/public/browser/android/java_interfaces.h b/content/public/browser/android/java_interfaces.h
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+++ b/content/public/browser/android/java_interfaces.h
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+// 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_PUBLIC_BROWSER_ANDROID_JAVA_INTERFACES_H_
+#define CONTENT_PUBLIC_BROWSER_ANDROID_JAVA_INTERFACES_H_
+
+#include "content/common/content_export.h"
+
+namespace shell {
+class InterfaceProvider;
+}
+
+namespace content {
+
+// Returns an InterfaceProvider for global Java-implemented interfaces.
+// This provides access to interfaces implemented in Java in the browser process
+// to C++ code in the browser process. This and the returned InterfaceProvider
+// may only be used on the UI thread.
+CONTENT_EXPORT shell::InterfaceProvider* GetGlobalJavaInterfaces();
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_JAVA_INTERFACES_H_