Add Java wrapper for RenderFrameHost

content/public/android/java/src/org/chromium/content/browser/framehost/RenderFrameHostImpl.java

Index: content/public/android/java/src/org/chromium/content/browser/framehost/RenderFrameHostImpl.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/framehost/RenderFrameHostImpl.java b/content/public/android/java/src/org/chromium/content/browser/framehost/RenderFrameHostImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..a4abedc3d373cddd49ab8a105d1dd3849df11d0a
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/framehost/RenderFrameHostImpl.java
@@ -0,0 +1,68 @@
+// 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.ThreadUtils;
+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.WebContents;
+
+/**
+ * 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;
+    private final WebContents mWebContents;
+
+    private RenderFrameHostImpl(long nativeRenderFrameHostAndroid, WebContents webContents) {
+        mNativeRenderFrameHostAndroid = nativeRenderFrameHostAndroid;
+        mWebContents = webContents;
+    }
+
+    @CalledByNative
+    private static RenderFrameHostImpl create(
+            long nativeRenderFrameHostAndroid, WebContents webContents) {
+        return new RenderFrameHostImpl(nativeRenderFrameHostAndroid, webContents);
+    }
+
+    @CalledByNative
+    private void clearNativePtr() {
+        mNativeRenderFrameHostAndroid = 0;
+    }
+
+    @Override
+    public void destroy() {
+        if (!ThreadUtils.runningOnUiThread()) {
+            throw new IllegalStateException("Attempting to destroy WebContents on non-UI thread");
+        }
+        if (mNativeRenderFrameHostAndroid != 0) {
+            nativeDestroyRenderFrameHost(mNativeRenderFrameHostAndroid);
+        }
+    }
+
+    @Override
+    public boolean isDestroyed() {
+        return mNativeRenderFrameHostAndroid == 0;
+    }
+
+    @Override
+    public WebContents getWebContents() {
+        return mWebContents;
+    }
+
+    @Override
+    public String getLastCommittedURL() {
+        return nativeGetLastCommittedURL(mNativeRenderFrameHostAndroid);
+    }
+
+    private static native void nativeDestroyRenderFrameHost(long renderFrameHostAndroid);
+
+    private native String nativeGetLastCommittedURL(long nativeRenderFrameHostAndroid);
+}