Move malloc/partition_alloc memory usage functions to base

base/process/process_metrics_win.cc

Index: base/process/process_metrics_win.cc
diff --git a/base/process/process_metrics_win.cc b/base/process/process_metrics_win.cc
index f5b191dfc08325f39a19b6f7331ae3c7e93a089a..8a278998043dbc4c8da7e083585c670f2fe48f20 100644
--- a/base/process/process_metrics_win.cc
+++ b/base/process/process_metrics_win.cc
@@ -17,6 +17,10 @@
 #include "base/process/memory.h"
 #include "base/sys_info.h"
 
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
 namespace base {
 namespace {
 
@@ -367,4 +371,22 @@ bool GetSystemMemoryInfo(SystemMemoryInfoKB* meminfo) {
   return true;
 }
 
+size_t ProcessMetrics::GetMallocUsage() {
+  // 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(crt_heap))
+    return 0;
+  size_t malloc_usage = 0;
+  PROCESS_HEAP_ENTRY heap_entry;
+  heap_entry.lpData = NULL;
+  while (::HeapWalk(crt_heap, &heap_entry) != 0) {
+    if ((heap_entry.wFlags & PROCESS_HEAP_ENTRY_BUSY) != 0)
+      malloc_usage += heap_entry.cbData;
+  }
+  ::HeapUnlock(crt_heap);
+  return malloc_usage;
+}
+
 }  // namespace base