Chief Executive Officer Larry Page is adding new features in mobile, video and Web services to boost user traffic and attract marketers as he seeks to bolster Google’s main ad business. As a result, the number of clicks on ads on YouTube, search and other Google sites increased 33 percent in the latest quarter, making up for a decline in ad prices. Since Google gets paid each time someone clicks on an advertised link, higher volumes result in more revenue. Google shares climbed as much as 3 percent in extended trading.