Add user_gesture param to WebContentsDelegate::ActivateContents

chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.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.
 
 #include "chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
@@ skipping 444 matching lines @@
     : public app_modal::JavaScriptNativeDialogFactory {
  public:
   ChromeJavaScriptNativeDialogCocoaFactory() {}
   ~ChromeJavaScriptNativeDialogCocoaFactory() override {}
 
  private:
   app_modal::NativeAppModalDialog* CreateNativeJavaScriptDialog(
       app_modal::JavaScriptAppModalDialog* dialog) override {
     app_modal::NativeAppModalDialog* d =
         new JavaScriptAppModalDialogCocoa(dialog);
+    // TODO(johnme): Can we sometimes be certain this was for a user gesture?
     dialog->web_contents()->GetDelegate()->ActivateContents(
-        dialog->web_contents());
+        dialog->web_contents(), false /* user_gesture */);
     return d;
   }
 
   DISALLOW_COPY_AND_ASSIGN(ChromeJavaScriptNativeDialogCocoaFactory);
 };
 
 }  // namespace
 
 void InstallChromeJavaScriptNativeDialogFactory() {
   app_modal::JavaScriptDialogManager::GetInstance()->
       SetNativeDialogFactory(
           make_scoped_ptr(new ChromeJavaScriptNativeDialogCocoaFactory));
 }