Hook memory tracing into Windows heap shim.

base/trace_event/malloc_dump_provider.cc

Index: base/trace_event/malloc_dump_provider.cc
diff --git a/base/trace_event/malloc_dump_provider.cc b/base/trace_event/malloc_dump_provider.cc
index 3b1a933bce56f8154f7871434f8cf692b02b3267..0da6a9d7f4639a633392913077670f040d3ceb33 100644
--- a/base/trace_event/malloc_dump_provider.cc
+++ b/base/trace_event/malloc_dump_provider.cc
@@ -128,6 +128,10 @@ bool MallocDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
   // fixed quantum, so the excess region will not be resident.
   // See crrev.com/1531463004 for detailed explanation.
   resident_size = stats.max_size_in_use;
+#elif defined(OS_WIN)
+  // TODO(siggi): DO NOT SUBMIT
+  // Walk the Windows heap backing the CRT allocation pool as is done in
+  // winheap_dump_provider_win.cc or ideally share the code.
 #else
   struct mallinfo info = mallinfo();
   DCHECK_GE(info.arena + info.hblkhd, info.uordblks);