Iterate CRT heap instead of process heap.

content/renderer/render_thread_impl.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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1793 matching lines @@
       FROM_HERE, record_purge_suspend_metric_closure_.callback(),
       base::TimeDelta::FromSeconds(15));
 }
 
 // TODO(tasak): Replace the following GetMallocUsage() with memory-infra
 // when it is possible to run memory-infra without tracing.
 #if defined(OS_WIN)
 namespace {
 
 static size_t GetMallocUsage() {
-  // Only checks the default process heap.
-  HANDLE heap = ::GetProcessHeap();
-  if (heap == NULL)
+  // Iterate through whichever heap the CRT is using.
+  HANDLE crt_heap = reinterpret_cast<HANDLE>(_get_heap_handle());
+  if (crt_heap == NULL)
     return 0;
-  if (!::HeapLock(heap))
+  if (!::HeapLock(crt_heap))
     return 0 ;
   size_t malloc_usage = 0;
   PROCESS_HEAP_ENTRY heap_entry;
   heap_entry.lpData = NULL;
-  while (::HeapWalk(heap, &heap_entry) != 0) {
+  while (::HeapWalk(crt_heap, &heap_entry) != 0) {
     if ((heap_entry.wFlags & PROCESS_HEAP_ENTRY_BUSY) != 0)
       malloc_usage += heap_entry.cbData;
   }
-  ::HeapUnlock(heap);
+  ::HeapUnlock(crt_heap);
   return malloc_usage;
 }
 
 }  // namespace
 #elif defined(OS_MACOSX) || defined(OS_IOS)
 namespace {
 
 static size_t GetMallocUsage() {
   malloc_statistics_t stats = {0};
   malloc_zone_statistics(nullptr, &stats);
@@ skipping 669 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content