Hook memory tracing into Windows heap shim.

base/trace_event/malloc_dump_provider.h

 // 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.
 
 #ifndef BASE_TRACE_EVENT_MALLOC_DUMP_PROVIDER_H_
 #define BASE_TRACE_EVENT_MALLOC_DUMP_PROVIDER_H_
 
 #include <istream>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/platform_thread.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "build/build_config.h"
 
-#if defined(OS_LINUX) || defined(OS_ANDROID) || \
+#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_WIN) || \
     (defined(OS_MACOSX) && !defined(OS_IOS))
 #define MALLOC_MEMORY_TRACING_SUPPORTED
 #endif
 
 namespace base {
 namespace trace_event {
 
 class AllocationRegister;
 
 // Dump provider which collects process-wide memory stats.
@@ skipping 31 matching lines @@
   // generation is malloc/new-ing for its own bookeeping data structures.
   PlatformThreadId tid_dumping_heap_;
 
   DISALLOW_COPY_AND_ASSIGN(MallocDumpProvider);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MALLOC_DUMP_PROVIDER_H_