Change the CRT initialization to create a new heap for Chrome.dll.

base/allocator/allocator_shim_override_ucrt_symbols_win.h

Index: base/allocator/allocator_shim_override_ucrt_symbols_win.h
diff --git a/base/allocator/allocator_shim_override_ucrt_symbols_win.h b/base/allocator/allocator_shim_override_ucrt_symbols_win.h
index 2aa872f1b3fbb1c5d4d7d120f96b5383f2d8b54d..b8d0d91ff57d6f4a5bac5bcf912c839ab12d580b 100644
--- a/base/allocator/allocator_shim_override_ucrt_symbols_win.h
+++ b/base/allocator/allocator_shim_override_ucrt_symbols_win.h
@@ -63,6 +63,30 @@ __declspec(restrict) void* calloc(size_t n, size_t size) {
   return ShimCalloc(n, size);
 }
 
+// The symbols
+//   * __acrt_heap
+//   * __acrt_initialize_heap
+//   * __acrt_uninitialize_heap
+//   * _get_heap_handle
+// must be overridden all or none, as they are otherwise supplied
+// by heap_handle.obj in the ucrt.lib file.
+HANDLE __acrt_heap = nullptr;
+
+bool __acrt_initialize_heap() {
+  __acrt_heap = ::HeapCreate(0, 0, 0);

[Will Harris, 2016/12/06 19:46:35]

do these flags match the process heap?

[Sigurður Ásgeirsson, 2016/12/06 20:28:15]

I believe so, the only flags documented are 

HEAP_CREATE_ENABLE_EXECUTE
HEAP_GENERATE_EXCEPTIONS
HEAP_NO_SERIALIZE

We still have the HeapSetInformation calls in base to set the per-process heap
corruption termination policy.

[Will Harris, 2016/12/06 21:33:09]

is HeapSetInformation called on this heap as well?

+  return true;
+}
+
+bool __acrt_uninitialize_heap() {
+  ::HeapDestroy(__acrt_heap);
+  __acrt_heap = nullptr;
+  return true;
+}
+
+intptr_t _get_heap_handle(void) {
+  return reinterpret_cast<intptr_t>(__acrt_heap);
+}
+
 // The default dispatch translation unit has to define also the following
 // symbols (unless they are ultimately routed to the system symbols):
 //   void malloc_stats(void);