Reland 1: "mac: Allow Chrome to hand off its active URL to other devices."

chrome/browser/ui/cocoa/handoff_active_url_observer_bridge.mm

+// Copyright 2014 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.
+
+#include "chrome/browser/ui/cocoa/handoff_active_url_observer_bridge.h"
+
+#include "chrome/browser/ui/cocoa/handoff_active_url_observer.h"
+
+HandoffActiveURLObserverBridge::HandoffActiveURLObserverBridge(
+    NSObject<HandoffActiveURLObserverBridgeDelegate>* delegate)
+    : delegate_(delegate) {
+  DCHECK(delegate_);
+  observer_.reset(new HandoffActiveURLObserver(this));
+}
+
+HandoffActiveURLObserverBridge::~HandoffActiveURLObserverBridge(){};
+
+void HandoffActiveURLObserverBridge::HandoffActiveURLChanged(
+    content::WebContents* web_contents) {
+  [delegate_ handoffActiveURLChanged:web_contents];
+}