Add Java wrapper for RenderFrameHost

content/public/android/java/src/org/chromium/content_public/browser/RenderFrameHost.java

+// Copyright 2017 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_public.browser;
+
+import org.chromium.content.browser.webcontents.WebContentsImpl;
+
+/**
+ * The RenderFrameHost Java wrapper to allow communicating with the native RenderFrameHost object.
+ *
+ */
+public abstract class RenderFrameHost {
+    /**
+     * @return The WebContents associated with this iframe.
+     */
+    public static WebContents getWebContents(RenderFrameHost rfh) {

[boliu, 2017/02/16 01:00:58]

this is still a layering violation

also why does this exist at all?

[rwlbuis, 2017/03/01 21:53:57]

It is being used in the test I added in the CL. But I removed it since the RFH
delegate idea seems better.

+        return WebContentsImpl.fromRenderFrameHost(rfh);
+    }
+
+    /**
+     * Get the last committed URL of the frame
+     *
+     * @return The last committed URL of the frame.
+     */
+    public abstract String getLastCommittedURL();

[boliu, 2017/02/16 01:00:58]

remove this in this CL, nothing uses it

[rwlbuis, 2017/03/01 21:53:57]

This is actually an important method for Payment Request. I added it in the test
as well.

+}