Add moar logging for "Couldn't load plug-in" errors.

ipc/ipc_sync_channel.cc

Index: ipc/ipc_sync_channel.cc
diff --git a/ipc/ipc_sync_channel.cc b/ipc/ipc_sync_channel.cc
index 9a897b534bd333a1c8714794df615964000bb0ca..682286f7a57cb239b43397de701a5095ca477fa6 100644
--- a/ipc/ipc_sync_channel.cc
+++ b/ipc/ipc_sync_channel.cc
@@ -301,9 +301,15 @@ bool SyncChannel::SyncContext::TryToUnblockListener(const Message* msg) {
     return false;
   }
 
+  // TODO(bauerb): Remove logging once investigation of http://crbug.com/141055
+  // has finished.
   if (!msg->is_reply_error()) {
-    deserializers_.back().send_result = deserializers_.back().deserializer->
+    bool send_result = deserializers_.back().deserializer->
         SerializeOutputParameters(*msg);
+    deserializers_.back().send_result = send_result;
+    LOG_IF(ERROR, !send_result) << "Couldn't deserialize reply message";
+  } else {
+    LOG(ERROR) << "Received error reply";
   }
   deserializers_.back().done_event->Signal();
 
@@ -357,6 +363,7 @@ void SyncChannel::SyncContext::OnChannelClosed() {
 void SyncChannel::SyncContext::OnSendTimeout(int message_id) {
   base::AutoLock auto_lock(deserializers_lock_);
   PendingSyncMessageQueue::iterator iter;
+  LOG(ERROR) << "Send timeout";
   for (iter = deserializers_.begin(); iter != deserializers_.end(); iter++) {
     if (iter->id == message_id) {
       iter->done_event->Signal();
@@ -368,6 +375,7 @@ void SyncChannel::SyncContext::OnSendTimeout(int message_id) {
 void SyncChannel::SyncContext::CancelPendingSends() {
   base::AutoLock auto_lock(deserializers_lock_);
   PendingSyncMessageQueue::iterator iter;
+  LOG(ERROR) << "Canceling pending sends";
   for (iter = deserializers_.begin(); iter != deserializers_.end(); iter++)
     iter->done_event->Signal();
 }
@@ -427,6 +435,7 @@ bool SyncChannel::SendWithTimeout(Message* message, int timeout_ms) {
   // *this* might get deleted in WaitForReply.
   scoped_refptr<SyncContext> context(sync_context());
   if (context->shutdown_event()->IsSignaled()) {
+    LOG(ERROR) << "shutdown event is signaled";
     delete message;
     return false;
   }