Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/document/DocumentWebContentsDelegate.java

+// Copyright 2015 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.chrome.browser.document;
+
+import org.chromium.components.web_contents_delegate_android.WebContentsDelegateAndroid;
+import org.chromium.content_public.browser.WebContents;
+
+/**
+ * Stubs out calls to the WebContentsDelegateAndroid.
+ */
+public class DocumentWebContentsDelegate extends WebContentsDelegateAndroid {
+    /**
+     * Singleton instance of the WebContentsDelegate.  Delegates can be assigned to multiple
+     * WebContents.
+     */
+    private static DocumentWebContentsDelegate sInstance;
+
+    /**
+     * Native side pointer to the stubbed WebContentsDelegate.
+     */
+    private long mNativePtr;
+
+    /**
+     * @return The Singleton instance, creating it if necessary.
+     */
+    public static DocumentWebContentsDelegate getInstance() {
+        if (sInstance == null) sInstance = new DocumentWebContentsDelegate();
+        return sInstance;
+    }
+
+    /**
+     * Attaches the native side delegate to the native WebContents.
+     * @param webContents The {@link WebContents} to attach to.
+     */
+    public void attachDelegate(WebContents webContents) {
+        nativeAttachContents(mNativePtr, webContents);
+    }
+
+    private DocumentWebContentsDelegate() {
+        mNativePtr = nativeInitialize();
+    }
+
+    private native long nativeInitialize();
+    private native void nativeAttachContents(
+            long nativeDocumentWebContentsDelegate, WebContents webContents);
+}