Add run-time CHECK to smoke-test allocator overrides

base/allocator/allocator_shim_win.cc

Index: base/allocator/allocator_shim_win.cc
diff --git a/base/allocator/allocator_shim_win.cc b/base/allocator/allocator_shim_win.cc
index 2c5a40fe5de73f4b4c7cd3e1839b28b66df8022b..b65544f5dd89ad00db76f36f894347a8506e76df 100644
--- a/base/allocator/allocator_shim_win.cc
+++ b/base/allocator/allocator_shim_win.cc
@@ -26,6 +26,12 @@ extern "C" {
 void* _crtheap = reinterpret_cast<void*>(1);
 }
 
+namespace base {
+namespace allocator {
+bool g_is_win_shim_layer_initialized = false;
+}  // namespace allocator
+}  // namespace base
+
 namespace {
 
 const size_t kWindowsPageSize = 4096;
@@ -211,6 +217,7 @@ intptr_t _get_heap_handle() {
 
 // heapinit.c
 int _heap_init() {
+  base::allocator::g_is_win_shim_layer_initialized = true;
   return win_heap_init() ? 1 : 0;
 }