Add -[NSView(CrDebugging) cr_recursiveDescription].

ui/base/cocoa/view_description.mm

Index: ui/base/cocoa/view_description.mm
diff --git a/ui/base/cocoa/view_description.mm b/ui/base/cocoa/view_description.mm
new file mode 100644
index 0000000000000000000000000000000000000000..1734f8817be9b774b9090835a6fa166017bcb9be
--- /dev/null
+++ b/ui/base/cocoa/view_description.mm
@@ -0,0 +1,31 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ui/base/cocoa/view_description.h"
+
+#if !NDEBUG
+
+@implementation NSView (CrDebugging)
+
+- (NSString*)cr_recursiveDescriptionWithPrefix:(NSString*)prefix {
+  NSString* description =
+      [NSString stringWithFormat:@"%@ <%@ %p, frame=%@, hidden=%d>\n",
+          prefix, [self class], self, NSStringFromRect([self frame]),
+          [self isHidden]];
+  prefix = [prefix stringByAppendingString:@"--"];
+
+  for (NSView* subview in [self subviews]) {
+    description = [description stringByAppendingString:
+        [subview cr_recursiveDescriptionWithPrefix:prefix]];
+  }
+  return description;
+}
+
+- (NSString*)cr_recursiveDescription {
+  return [self cr_recursiveDescriptionWithPrefix:@""];
+}
+
+@end
+
+#endif  // !NDEBUG