Add a GUID to base::SharedMemoryHandle.

base/memory/shared_memory_handle_win.cc

Index: base/memory/shared_memory_handle_win.cc
diff --git a/base/memory/shared_memory_handle_win.cc b/base/memory/shared_memory_handle_win.cc
index 7480151b1ab3a8bd0474f576e898fc3e9ce85102..4fe8e7e6b38d45ea5c0797245b3c3a0bf9e4b8d4 100644
--- a/base/memory/shared_memory_handle_win.cc
+++ b/base/memory/shared_memory_handle_win.cc
@@ -5,28 +5,15 @@
 #include "base/memory/shared_memory_handle.h"
 
 #include "base/logging.h"
+#include "base/unguessable_token.h"
 
 namespace base {
 
 SharedMemoryHandle::SharedMemoryHandle()
     : handle_(nullptr), ownership_passes_to_ipc_(false) {}
 
-SharedMemoryHandle::SharedMemoryHandle(HANDLE h)
-    : handle_(h), ownership_passes_to_ipc_(false) {}
-
-SharedMemoryHandle::SharedMemoryHandle(const SharedMemoryHandle& handle)
-    : handle_(handle.handle_),
-      ownership_passes_to_ipc_(handle.ownership_passes_to_ipc_) {}
-
-SharedMemoryHandle& SharedMemoryHandle::operator=(
-    const SharedMemoryHandle& handle) {
-  if (this == &handle)
-    return *this;
-
-  handle_ = handle.handle_;
-  ownership_passes_to_ipc_ = handle.ownership_passes_to_ipc_;
-  return *this;
-}
+SharedMemoryHandle(HANDLE h, const base::UnguessableToken& guid)
+    : handle_(h), ownership_passes_to_ipc_(false), guid_(guid) {}
 
 void SharedMemoryHandle::Close() const {
   DCHECK(handle_ != nullptr);
@@ -45,7 +32,7 @@ SharedMemoryHandle SharedMemoryHandle::Duplicate() const {
   if (!success)
     return SharedMemoryHandle();
 
-  base::SharedMemoryHandle handle(duped_handle);
+  base::SharedMemoryHandle handle(duped_handle, GetGUID());

[Nico, 2017/05/04 17:42:13]

So several handles can have the same guid? Document that in header somehow.

[erikchen, 2017/05/04 19:21:13]

Done.

   handle.SetOwnershipPassesToIPC(true);
   return handle;
 }