Add UMA metrics to log attachment broker errors.

ipc/attachment_broker_privileged_win.cc

 // Copyright 2015 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.
 
 #include "ipc/attachment_broker_privileged_win.h"
 
 #include <windows.h>
 
 #include "base/process/process.h"
 #include "ipc/attachment_broker_messages.h"
@@ skipping 41 matching lines @@
 }
 
 void AttachmentBrokerPrivilegedWin::OnDuplicateWinHandle(
     const IPC::Message& message) {
   AttachmentBrokerMsg_DuplicateWinHandle::Param param;
   if (!AttachmentBrokerMsg_DuplicateWinHandle::Read(&message, &param))
     return;
   IPC::internal::HandleAttachmentWin::WireFormat wire_format =
       base::get<0>(param);
 
-  if (wire_format.destination_process == base::kNullProcessId)
+  if (wire_format.destination_process == base::kNullProcessId) {
+    LogError(NO_DESTINATION);
     return;
+  }
 
   HandleWireFormat new_wire_format =
       DuplicateWinHandle(wire_format, message.get_sender_pid());
   RouteDuplicatedHandle(new_wire_format);
 }
 
 void AttachmentBrokerPrivilegedWin::RouteDuplicatedHandle(
     const HandleWireFormat& wire_format) {
   // This process is the destination.
   if (wire_format.destination_process == base::Process::Current().Pid()) {
     scoped_refptr<BrokerableAttachment> attachment(
         new internal::HandleAttachmentWin(wire_format));
     HandleReceivedAttachment(attachment);
     return;
   }
 
   // Another process is the destination.
   base::ProcessId dest = wire_format.destination_process;
   Sender* sender = GetSenderWithProcessId(dest);
   if (!sender) {
     // Assuming that this message was not sent from a malicious process, the
     // channel endpoint that would have received this message will block
     // forever.
     LOG(ERROR) << "Failed to deliver brokerable attachment to process with id: "
                << dest;
+    LogError(DESTINATION_NOT_FOUND);
     return;
   }
 
+  LogError(DESTINATION_FOUND);
   sender->Send(new AttachmentBrokerMsg_WinHandleHasBeenDuplicated(wire_format));
 }
 
 AttachmentBrokerPrivilegedWin::HandleWireFormat
 AttachmentBrokerPrivilegedWin::DuplicateWinHandle(
     const HandleWireFormat& wire_format,
     base::ProcessId source_pid) {
   HandleWireFormat new_wire_format;
   new_wire_format.destination_process = wire_format.destination_process;
   new_wire_format.attachment_id = wire_format.attachment_id;
@@ skipping 26 matching lines @@
                                      dest_process.Handle(), &new_handle,
                                      desired_access, FALSE, options);
 
     new_wire_format.handle = (result != 0) ? HandleToLong(new_handle) : 0;
   }
 
   return new_wire_format;
 }
 
 }  // namespace IPC