Resolve media/cast crypto crash, and add crash reporting.

media/cast/net/cast_transport_sender_impl.cc

 // Copyright 2014 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 "media/cast/net/cast_transport_sender_impl.h"
 
 #include "base/single_thread_task_runner.h"
 #include "base/values.h"
 #include "media/cast/net/cast_transport_defines.h"
 #include "media/cast/net/udp_transport.h"
@@ skipping 224 matching lines @@
                config.feedback_ssrc));
   pacer_.RegisterVideoSsrc(config.ssrc);
   AddValidSsrc(config.feedback_ssrc);
   status_callback_.Run(TRANSPORT_VIDEO_INITIALIZED);
 }
 
 namespace {
 void EncryptAndSendFrame(const EncodedFrame& frame,
                          TransportEncryptionHandler* encryptor,
                          RtpSender* sender) {
-  if (encryptor->is_activated()) {
+  // TODO(miu): We probably shouldn't attempt to send an empty frame, but this
+  // issue is still under investigation.  http://crbug.com/519022
+  if (encryptor->is_activated() && !frame.data.empty()) {
     EncodedFrame encrypted_frame;
     frame.CopyMetadataTo(&encrypted_frame);
     if (encryptor->Encrypt(frame.frame_id, frame.data, &encrypted_frame.data)) {
       sender->SendFrame(encrypted_frame);
     } else {
       LOG(ERROR) << "Encryption failed.  Not sending frame with ID "
                  << frame.frame_id;
     }
   } else {
     sender->SendFrame(frame);
@@ skipping 224 matching lines @@
                   sender_ssrc);
   rtcp.SendRtcpFromRtpReceiver(time_data,
                                cast_message,
                                target_delay,
                                rtcp_events,
                                rtp_receiver_statistics);
 }
 
 }  // namespace cast
 }  // namespace media