[tracing] Fix MemoryDumpManager to support startup tracing

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 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/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 624 matching lines @@
     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
   }
 
   if (parsed_command_line_.HasSwitch(
           switches::kEnableAggressiveDOMStorageFlushing)) {
     TRACE_EVENT0("startup",
                  "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
     DOMStorageArea::EnableAggressiveCommitDelay();
   }
 
-  base::trace_event::MemoryDumpManager::GetInstance()->Initialize();
-
-  // Enable the dump providers.
+  // Enable memory-infra dump providers.
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
       HostSharedBitmapManager::current());
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
       skia::SkiaMemoryDumpProvider::GetInstance());
 
 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
       base::MessageLoop::current()->task_runner(),
       ::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
       ::GetHeapProfile));
@@ skipping 722 matching lines @@
   DCHECK(is_tracing_startup_for_duration_);
 
   is_tracing_startup_for_duration_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content