Mac: Support default browser Handoff in Yosemite.

chrome/browser/app_controller_mac.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/app_controller_mac.h"
 
 #include "apps/app_shim/extension_app_shim_handler_mac.h"
 #include "apps/app_window_registry.h"
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 1528 matching lines @@
   [self performSelector:@selector(delayedScreenParametersUpdate)
              withObject:nil
              afterDelay:0];
 }
 
 - (void)delayedScreenParametersUpdate {
   FOR_EACH_OBSERVER(ui::WorkAreaWatcherObserver, workAreaChangeObservers_,
       WorkAreaChanged());
 }
 
+- (BOOL)application:(NSApplication*)application
+    willContinueUserActivityWithType:(NSString*)userActivityType {
+  return [userActivityType isEqualToString:NSUserActivityTypeBrowsingWeb];
+}
+
+- (BOOL)application:(NSApplication*)application
+    continueUserActivity:(NSUserActivity*)userActivity
+      restorationHandler:(void (^)(NSArray*))restorationHandler {
+  if (![userActivity.activityType
+          isEqualToString:NSUserActivityTypeBrowsingWeb]) {
+    return NO;
+  }
+
+  NSURL* url = userActivity.webPageURL;
+  if (!url)
+    return NO;
+
+  GURL gurl(base::SysNSStringToUTF8([url absoluteString]));
+  std::vector<GURL> gurlVector;
+  gurlVector.push_back(gurl);
+
+  [self openUrls:gurlVector];
+  return YES;
+}
+
+- (void)application:(NSApplication*)application
+    didFailToContinueUserActivityWithType:(NSString*)userActivityType
+                                    error:(NSError*)error {
+}
+
 @end  // @implementation AppController
 
 //---------------------------------------------------------------------------
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac