Reland of [tracing] Dump child processes' memory metrics in browser

base/trace_event/memory_dump_manager.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 "base/trace_event/memory_dump_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/heap_profiler_stack_frame_deduplicator.h"
 #include "base/trace_event/heap_profiler_type_name_deduplicator.h"
 #include "base/trace_event/malloc_dump_provider.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "base/trace_event/memory_dump_session_state.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "build/build_config.h"
 
-#if !defined(OS_NACL)
-#include "base/trace_event/process_memory_totals_dump_provider.h"
-#endif
-
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-#include "base/trace_event/process_memory_maps_dump_provider.h"
-#endif
-
 #if defined(OS_ANDROID)
 #include "base/trace_event/java_heap_dump_provider_android.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/trace_event/winheap_dump_provider_win.h"
 #endif
 
 namespace base {
 namespace trace_event {
@@ skipping 102 matching lines @@
                                    bool is_coordinator) {
   {
     AutoLock lock(lock_);
     DCHECK(delegate);
     DCHECK(!delegate_);
     delegate_ = delegate;
     is_coordinator_ = is_coordinator;
   }
 
 // Enable the core dump providers.
-#if !defined(OS_NACL)
-  RegisterDumpProvider(ProcessMemoryTotalsDumpProvider::GetInstance(),
-                       "ProcessMemoryTotals", nullptr);
-#endif
-
 #if defined(MALLOC_MEMORY_TRACING_SUPPORTED)
   RegisterDumpProvider(MallocDumpProvider::GetInstance(), "Malloc", nullptr);
 #endif
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-  RegisterDumpProvider(ProcessMemoryMapsDumpProvider::GetInstance(),
-                       "ProcessMemoryMaps", nullptr);
-#endif
-
 #if defined(OS_ANDROID)
   RegisterDumpProvider(JavaHeapDumpProvider::GetInstance(), "JavaHeap",
                        nullptr);
 #endif
 
 #if defined(OS_WIN)
   RegisterDumpProvider(WinHeapDumpProvider::GetInstance(), "WinHeap", nullptr);
 #endif
 
   // If tracing was enabled before initializing MemoryDumpManager, we missed the
@@ skipping 477 matching lines @@
   auto iter = process_dumps.find(pid);
   if (iter == process_dumps.end()) {
     scoped_ptr<ProcessMemoryDump> new_pmd(new ProcessMemoryDump(session_state));
     iter = process_dumps.insert(std::make_pair(pid, std::move(new_pmd))).first;
   }
   return iter->second.get();
 }
 
 }  // namespace trace_event
 }  // namespace base