Fix for URL opening code

chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc

Index: chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
diff --git a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
index 99e8752bb20b00b2c654c7d017bf5d085d95af8f..c8b161ce065fe59361320c09fd7f7a5abf0bef5a 100644
--- a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
+++ b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
@@ -21,7 +21,11 @@
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/mac/bluetooth_utility.h"
 #include "chrome/browser/shell_integration.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "components/flags_ui/pref_service_flags_storage.h"
+#include "components/startup_metric_utils/browser/startup_metric_utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
 #include "ui/base/touch/touch_device.h"
@@ -510,7 +514,18 @@ void ChromeBrowserMainExtraPartsMetrics::PostBrowserStart() {
   is_screen_observer_ = true;
 
 #if !defined(OS_ANDROID)
-  metrics::BeginFirstWebContentsProfiling();
+  const BrowserList* browser_list = BrowserList::GetInstance();
+
+  auto first_browser = browser_list->begin();
+  if (first_browser != browser_list->end()) {
+    TabStripModel* tab_strip = (*first_browser)->tab_strip_model();
+    DCHECK(tab_strip);
+    if (tab_strip->empty()) {
+      startup_metric_utils::SetNonBrowserUIDisplayed();

[gab, 2017/06/13 16:29:34]

Add a comment about when this happens

[eugenebng, 2017/06/14 11:17:46]

It was happening when I started this fix. Now I can't reproduce this odd case
manually or in tests, so DCHECK against it now.

[gab, 2017/06/14 17:03:23]

Ok but I'd say keep a comment referring to this discussion in case someone hits
the DCHECK:
https://codereview.chromium.org/2798143004/diff/280001/chrome/browser/metrics...

[eugenebng, 2017/06/15 00:31:49]

Added comment.

+    } else {
+      metrics::BeginFirstWebContentsProfiling();
+    }
+  }
   metrics::TabUsageRecorder::InitializeIfNeeded();
 #endif  // !defined(OS_ANDROID)
 }