Add Java wrapper for RenderFrameHost

content/public/android/java/src/org/chromium/content/browser/framehost/RenderFrameHostImpl.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.browser.framehost;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.content_public.browser.RenderFrameHost;
+import org.chromium.content_public.browser.RenderFrameHostDelegate;
+
+/**
+ * The RenderFrameHostImpl Java wrapper to allow communicating with the native RenderFrameHost
+ * object.
+ */
+@JNINamespace("content")
+// TODO(tedchoc): Remove the package restriction once this class moves to a non-public content
+//               package whose visibility will be enforced via DEPS.
+/* package */ class RenderFrameHostImpl implements RenderFrameHost {
+    private long mNativeRenderFrameHostAndroid;
+    RenderFrameHostDelegate mDelegate;

[boliu, 2017/03/03 23:55:29]

final, also comment that this may be null

[rwlbuis, 2017/03/06 20:58:58]

Done.

+
+    private RenderFrameHostImpl(
+            long nativeRenderFrameHostAndroid, RenderFrameHostDelegate delegate) {
+        mNativeRenderFrameHostAndroid = nativeRenderFrameHostAndroid;
+        mDelegate = delegate;
+    }
+
+    @CalledByNative
+    private static RenderFrameHostImpl create(
+            long nativeRenderFrameHostAndroid, RenderFrameHostDelegate delegate) {
+        return new RenderFrameHostImpl(nativeRenderFrameHostAndroid, delegate);
+    }
+
+    @CalledByNative
+    private void clearNativePtr() {
+        mNativeRenderFrameHostAndroid = 0;
+    }
+
+    @Override
+    public RenderFrameHostDelegate getRenderFrameHostDelegate() {
+        return mDelegate;
+    }
+
+    @Override
+    public String getLastCommittedURL() {
+        return nativeGetLastCommittedURL(mNativeRenderFrameHostAndroid);

[boliu, 2017/03/03 23:55:29]

need to check for 0

[rwlbuis, 2017/03/06 20:58:58]

Done.

+    }
+
+    private native String nativeGetLastCommittedURL(long nativeRenderFrameHostAndroid);
+}