[chromedriver] Include extension popups in list of windows

BUG=

Review URL: https://codereview.chromium.org/802803002

Cr-Commit-Position: refs/heads/master@{#308215}

chrome/test/chromedriver/chrome/chrome_impl.cc

@@ -52,9 +52,10 @@ Status ChromeImpl::GetWebViewIds(std::list<std::string>* web_view_ids) {
   // Check for newly-opened web views.
   for (size_t i = 0; i < views_info.GetSize(); ++i) {
     const WebViewInfo& view = views_info.Get(i);
-    if (view.type != WebViewInfo::kPage && view.type != WebViewInfo::kApp)
-      continue;
-
+    if (view.type == WebViewInfo::kPage ||
+        view.type == WebViewInfo::kApp ||
+        (view.type == WebViewInfo::kOther &&
+         view.url.find("chrome-extension://") == 0)) {
       bool found = false;
       for (WebViewList::const_iterator web_view_iter = web_views_.begin();
            web_view_iter != web_views_.end(); ++web_view_iter) {
@@ -79,6 +80,7 @@ Status ChromeImpl::GetWebViewIds(std::list<std::string>* web_view_ids) {
             devtools_http_client_->device_metrics())));
       }
     }
+  }
 
   std::list<std::string> web_view_ids_tmp;
   for (WebViewList::const_iterator web_view_iter = web_views_.begin();