[memory-infra] Log reasons for memory dump failure

content/browser/tracing/tracing_controller_impl.cc

 // Copyright (c) 2013 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 "content/browser/tracing/tracing_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/cpu.h"
 #include "base/files/file_util.h"
 #include "base/guid.h"
 #include "base/json/string_escape.h"
@@ skipping 983 matching lines @@
       it == pending_memory_dump_filters_.end()) {
     DLOG(WARNING) << "Received unexpected memory dump response: " << dump_guid;
     return;
   }
 
   DCHECK_GT(pending_memory_dump_ack_count_, 0);
   --pending_memory_dump_ack_count_;
   pending_memory_dump_filters_.erase(it);
   if (!success) {
     ++failed_memory_dump_count_;
-    DLOG(WARNING) << "Global memory dump failed because of NACK from child "
-                  << trace_message_filter->peer_pid();
+    VLOG(1) << "Global memory dump failed because of NACK from child "
+            << trace_message_filter->peer_pid();
   }
   FinalizeGlobalMemoryDumpIfAllProcessesReplied();
 }
 
 void TracingControllerImpl::OnBrowserProcessMemoryDumpDone(uint64_t dump_guid,
                                                            bool success) {
   DCHECK_GT(pending_memory_dump_ack_count_, 0);
   --pending_memory_dump_ack_count_;
   if (!success) {
     ++failed_memory_dump_count_;
-    DLOG(WARNING) << "Global memory dump aborted on the current process";
+    VLOG(1) << "Global memory dump aborted on the current process";
   }
   FinalizeGlobalMemoryDumpIfAllProcessesReplied();
 }
 
 void TracingControllerImpl::FinalizeGlobalMemoryDumpIfAllProcessesReplied() {
   if (pending_memory_dump_ack_count_ > 0)
     return;
 
   DCHECK_NE(0u, pending_memory_dump_guid_);
   const bool global_success = failed_memory_dump_count_ == 0;
   if (!pending_memory_dump_callback_.is_null()) {
     pending_memory_dump_callback_.Run(pending_memory_dump_guid_,
                                       global_success);
     pending_memory_dump_callback_.Reset();
   }
   pending_memory_dump_guid_ = 0;
 }
 
 }  // namespace content