[chromedriver] Include print preview dialog in window handles.

chrome/test/chromedriver/chrome/chrome_impl.cc

Index: chrome/test/chromedriver/chrome/chrome_impl.cc
diff --git a/chrome/test/chromedriver/chrome/chrome_impl.cc b/chrome/test/chromedriver/chrome/chrome_impl.cc
index 97225aa0dffc2b95c6f04f2d235c25a0a5e2b139..aedea8df69617fab05b82a76ab56655601fba19c 100644
--- a/chrome/test/chromedriver/chrome/chrome_impl.cc
+++ b/chrome/test/chromedriver/chrome/chrome_impl.cc
@@ -55,7 +55,8 @@ Status ChromeImpl::GetWebViewIds(std::list<std::string>* web_view_ids) {
     if (view.type == WebViewInfo::kPage ||
         view.type == WebViewInfo::kApp ||
         (view.type == WebViewInfo::kOther &&
-         view.url.find("chrome-extension://") == 0)) {
+         (view.url.find("chrome-extension://") == 0 ||
+          view.url == "chrome://print/"))) {
       bool found = false;
       for (WebViewList::const_iterator web_view_iter = web_views_.begin();
            web_view_iter != web_views_.end(); ++web_view_iter) {