Add a temporary crash key to debug nib loading issues.

chrome/browser/ui/cocoa/toolbar/toolbar_controller.mm

Index: chrome/browser/ui/cocoa/toolbar/toolbar_controller.mm
diff --git a/chrome/browser/ui/cocoa/toolbar/toolbar_controller.mm b/chrome/browser/ui/cocoa/toolbar/toolbar_controller.mm
index 2ab43137c90eec2e8a2a4f3dd3c826f2a42eee9a..5e8cbc2b398ae59edb79f5fb52c247d509dd8a62 100644
--- a/chrome/browser/ui/cocoa/toolbar/toolbar_controller.mm
+++ b/chrome/browser/ui/cocoa/toolbar/toolbar_controller.mm
@@ -4,8 +4,10 @@
 
 #import "chrome/browser/ui/cocoa/toolbar/toolbar_controller.h"
 
+#include <sys/stat.h>
 #include <algorithm>
 
+#include "base/debug/crash_logging.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
@@ -52,6 +54,7 @@
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/toolbar/app_menu_icon_controller.h"
 #include "chrome/browser/ui/toolbar/app_menu_model.h"
+#include "chrome/common/crash_keys.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
@@ -252,6 +255,25 @@ class NotificationBridge : public AppMenuIconController::Delegate {
 }
 
 - (void)viewDidLoad {
+  // Temporary: collect information about a potentially missing or inaccessible
+  // nib (https://crbug.com/685985)
+  NSString* nibPath = [self.nibBundle pathForResource:@"Toolbar" ofType:@"nib"];
+  struct stat sb;
+  int nibErrno = 0;
+  if (stat(nibPath.fileSystemRepresentation, &sb) != 0) {
+    nibErrno = errno;
+  }
+  NSString* closestPath = nibPath;
+  while (closestPath && stat(closestPath.fileSystemRepresentation, &sb) != 0) {
+    closestPath = [closestPath stringByDeletingLastPathComponent];
+  }
+  base::debug::ScopedCrashKey nibCrashKey {
+    crash_keys::mac::kToolbarNibInfo,
+        [NSString stringWithFormat:@"errno: %d nib: %@ closest: %@", nibErrno,
+                                   nibPath, closestPath]
+            .UTF8String
+  };
+
   // When linking and running on 10.10+, both -awakeFromNib and -viewDidLoad may
   // be called, don't initialize twice.
   if (locationBarView_) {