Reduce the log level of frequently occuring DVLOGs

mojo/edk/system/ports/node.cc

 // Copyright 2016 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 "mojo/edk/system/ports/node.h"
 
 #include <string.h>
 
 #include <utility>
 
@@ skipping 254 matching lines @@
 
 int Node::GetMessage(const PortRef& port_ref, ScopedMessage* message) {
   return GetMessageIf(port_ref, nullptr, message);
 }
 
 int Node::GetMessageIf(const PortRef& port_ref,
                        std::function<bool(const Message&)> selector,
                        ScopedMessage* message) {
   *message = nullptr;
 
-  DVLOG(2) << "GetMessageIf for " << port_ref.name() << "@" << name_;
+  DVLOG(4) << "GetMessageIf for " << port_ref.name() << "@" << name_;
 
   Port* port = port_ref.port();
   {
     base::AutoLock lock(port->lock);
 
     // This could also be treated like the port being unknown since the
     // embedder should no longer be referring to a port that has been sent.
     if (port->state != Port::kReceiving)
       return ERROR_PORT_STATE_UNEXPECTED;
 
@@ skipping 135 matching lines @@
   const auto* event = GetEventData<UserEventData>(*message);
 
 #if DCHECK_IS_ON()
   std::ostringstream ports_buf;
   for (size_t i = 0; i < message->num_ports(); ++i) {
     if (i > 0)
       ports_buf << ",";
     ports_buf << message->ports()[i];
   }
 
-  DVLOG(2) << "AcceptMessage " << event->sequence_num
+  DVLOG(4) << "AcceptMessage " << event->sequence_num
              << " [ports=" << ports_buf.str() << "] at "
              << port_name << "@" << name_;
 #endif
 
   scoped_refptr<Port> port = GetPort(port_name);
 
   // Even if this port does not exist, cannot receive anymore messages or is
   // buffering or proxying messages, we still need these ports to be bound to
   // this node. When the message is forwarded, these ports will get transferred
   // following the usual method. If the message cannot be accepted, then the
@@ skipping 629 matching lines @@
                    port->peer_node_name,
                    message->mutable_ports() + i,
                    port_descriptors + i);
     }
 
     for (size_t i = 0; i < message->num_ports(); ++i)
       ports[i]->lock.Release();
   }
 
 #if DCHECK_IS_ON()
-  DVLOG(2) << "Sending message "
+  DVLOG(4) << "Sending message "
            << GetEventData<UserEventData>(*message)->sequence_num
            << " [ports=" << ports_buf.str() << "]"
            << " from " << port_name << "@" << name_
            << " to " << port->peer_port_name << "@" << port->peer_node_name;
 #endif
 
   GetMutableEventHeader(message)->port_name = port->peer_port_name;
   return OK;
 }
 
@@ skipping 284 matching lines @@
 
   if (num_data_bytes)
     memcpy(header + 1, data, num_data_bytes);
 
   return message;
 }
 
 }  // namespace ports
 }  // namespace edk
 }  // namespace mojo