[Mac] Tweak crash logging for -sendEvent: crash.

https://chromiumcodereview.appspot.com/11140040 adds the event's
-description as a breakpad key.  Unfortunately, event type 28, which
is undocumented, is sent by Mountain Lion when you do a control-scroll
zoom.  Work around it manually.

BUG=154483,156103


Review URL: https://chromiumcodereview.appspot.com/11198008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162397 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chrome_browser_application_mac.mm

@@ -435,7 +435,10 @@ void SwizzleInit() {
   // Current hypothesis is that it's a keyboard accelerator.
   // http://crbug.com/154483
   static NSString* const kSendEventKey = @"sendevent";
-  base::mac::ScopedCrashKey key(kSendEventKey, [event description]);
+  // For NSEventType 28, recursive -description causes a crash.
+  // Not much to be done, that type is undocumented.
+  NSString* value = [event type] == 28 ? @"type=28" : [event description];
+  base::mac::ScopedCrashKey key(kSendEventKey, value);
 
   base::mac::ScopedSendingEvent sendingEventScoper;
   for (id<CrApplicationEventHookProtocol> handler in eventHooks_.get()) {