Add creation tracking for ActiveVerifier.

base/win/scoped_handle.cc

Index: base/win/scoped_handle.cc
diff --git a/base/win/scoped_handle.cc b/base/win/scoped_handle.cc
index f358c99b6f011073f19706c1643a8529e7c54b75..8739ea7887ba0b39339f504d5f54600f4961a085 100644
--- a/base/win/scoped_handle.cc
+++ b/base/win/scoped_handle.cc
@@ -95,6 +95,7 @@ class ActiveVerifier {
 
   static void InstallVerifier();
 
+  base::debug::StackTrace creation_stack_;
   bool enabled_;
   bool closing_;
   NativeLock* lock_;
@@ -168,6 +169,7 @@ void ActiveVerifier::StartTracking(HANDLE handle, const void* owner,
   if (!result.second) {
     Info other = result.first->second;
     base::debug::Alias(&other);
+    base::debug::Alias(&creation_stack_);
     CHECK(false);  // Attempt to start tracking already tracked handle.
   }
 }
@@ -179,12 +181,15 @@ void ActiveVerifier::StopTracking(HANDLE handle, const void* owner,
 
   AutoNativeLock lock(*lock_);
   HandleMap::iterator i = map_.find(handle);
-  if (i == map_.end())
+  if (i == map_.end()) {
+    base::debug::Alias(&creation_stack_);
     CHECK(false);  // Attempting to close an untracked handle.
+  }
 
   Info other = i->second;
   if (other.owner != owner) {
     base::debug::Alias(&other);
+    base::debug::Alias(&creation_stack_);
     CHECK(false);  // Attempting to close a handle not owned by opener.
   }
 
@@ -209,6 +214,7 @@ void ActiveVerifier::OnHandleBeingClosed(HANDLE handle) {
 
   Info other = i->second;
   base::debug::Alias(&other);
+  base::debug::Alias(&creation_stack_);
   CHECK(false);  // CloseHandle called on tracked handle.
 }