[Windows] Output the error code when sending sync broker message fails in mojo/edk

R=rockot@chromium.org

Change-Id: I37bb122815288605e5df28ba9090eff02de8c864
Reviewed-on: https://chromium-review.googlesource.com/887023Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539070}

AUTHORS

@@ -953,6 +953,7 @@ TeamSpeak Systems GmbH <*@teamspeak.com>
 The Chromium Authors <*@chromium.org>
 The MathWorks, Inc. <binod.pant@mathworks.com>
 Torchmobile Inc.
+Upwork <*@cloud.upwork.com>
 Venture 3 Systems LLC <*@venture3systems.com>
 Vewd Software AS <*@vewd.com>
 Yandex LLC <*@yandex-team.ru>

mojo/edk/system/broker_win.cc

@@ -131,7 +131,7 @@ scoped_refptr<PlatformSharedBuffer> Broker::GetSharedBuffer(size_t num_bytes) {
                             &bytes_written, nullptr);
   if (!result ||
       static_cast<size_t>(bytes_written) != out_message->data_num_bytes()) {
-    LOG(ERROR) << "Error sending sync broker message";
+    PLOG(ERROR) << "Error sending sync broker message";
     return nullptr;
   }