Add global and per-WebContents java InterfaceRegistries.

content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java

Index: content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java b/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..b1d920a97f8a9bfc25699749fbcdb504077b9c47
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
@@ -0,0 +1,31 @@
+// 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.
+
+package org.chromium.content.browser;
+
+import android.content.Context;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.content_public.browser.InterfaceRegistrar;
+import org.chromium.content_public.browser.WebContents;
+import org.chromium.mojo.system.impl.CoreImpl;
+import org.chromium.services.shell.InterfaceRegistry;
+
+@JNINamespace("content")
+class InterfaceRegistrarImpl {
+    @CalledByNative
+    static void createInterfaceRegistryForContext(int nativeHandle, Context applicationContext) {
+        InterfaceRegistry registry = InterfaceRegistry.create(
+                CoreImpl.getInstance().acquireNativeHandle(nativeHandle).toMessagePipeHandle());
+        InterfaceRegistrar.Registry.applyContextRegistrars(registry, applicationContext);
+    }
+
+    @CalledByNative
+    static void createInterfaceRegistryForWebContents(int nativeHandle, WebContents webContents) {
+        InterfaceRegistry registry = InterfaceRegistry.create(
+                CoreImpl.getInstance().acquireNativeHandle(nativeHandle).toMessagePipeHandle());
+        InterfaceRegistrar.Registry.applyWebContentsRegistrars(registry, webContents);
+    }
+}