[tracing] Sanitize process memory dumps for background mode

gin/v8_isolate_memory_dump_provider_unittest.cc

 // Copyright 2015 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 "gin/v8_isolate_memory_dump_provider.h"
 
 #include <memory>
 
 #include "base/trace_event/process_memory_dump.h"
 #include "gin/public/isolate_holder.h"
 #include "gin/test/v8_test.h"
 
 namespace gin {
 
 typedef V8Test V8MemoryDumpProviderTest;
 
 // Checks if the dump provider runs without crashing and dumps root objects.
 TEST_F(V8MemoryDumpProviderTest, DumpStatistics) {
   // Sets the track objects flag for dumping object statistics. Since this is
   // not set before V8::InitializePlatform the sizes will not be accurate, but
   // this serves the purpose of this test.
   const char track_objects_flag[] = "--track-gc-object-stats";
   v8::V8::SetFlagsFromString(track_objects_flag,
                              static_cast<int>(strlen(track_objects_flag)));
 
-  std::unique_ptr<base::trace_event::ProcessMemoryDump> process_memory_dump(
-      new base::trace_event::ProcessMemoryDump(nullptr));
   base::trace_event::MemoryDumpArgs dump_args = {
       base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
+  std::unique_ptr<base::trace_event::ProcessMemoryDump> process_memory_dump(
+      new base::trace_event::ProcessMemoryDump(nullptr, dump_args));
   instance_->isolate_memory_dump_provider_for_testing()->OnMemoryDump(
       dump_args, process_memory_dump.get());
   const base::trace_event::ProcessMemoryDump::AllocatorDumpsMap&
       allocator_dumps = process_memory_dump->allocator_dumps();
 
   bool did_dump_isolate_stats = false;
   bool did_dump_space_stats = false;
   bool did_dump_objects_stats = false;
   for (const auto& it : allocator_dumps) {
     const std::string& dump_name = it.first;
     if (dump_name.find("v8/isolate") != std::string::npos) {
       did_dump_isolate_stats = true;
     }
     if (dump_name.find("heap_spaces") != std::string::npos) {
       did_dump_space_stats = true;
     } else if (dump_name.find("heap_objects") != std::string::npos) {
       did_dump_objects_stats = true;
     }
   }
 
   ASSERT_TRUE(did_dump_isolate_stats);
   ASSERT_TRUE(did_dump_space_stats);
   ASSERT_TRUE(did_dump_objects_stats);
 }
 
 }  // namespace gin