Track entries pending Doom in SimpleCache backend.

net/disk_cache/simple/simple_entry_impl.cc

Index: net/disk_cache/simple/simple_entry_impl.cc
diff --git a/net/disk_cache/simple/simple_entry_impl.cc b/net/disk_cache/simple/simple_entry_impl.cc
index 32a22b44984766480bb5d432646b6aad47500116..9a53d7f7fa90738affdf7afe74496b28cebdb214 100644
--- a/net/disk_cache/simple/simple_entry_impl.cc
+++ b/net/disk_cache/simple/simple_entry_impl.cc
@@ -891,11 +891,13 @@ void SimpleEntryImpl::WriteDataInternal(int stream_index,
 }
 
 void SimpleEntryImpl::DoomEntryInternal(const CompletionCallback& callback) {
+  if (backend_)
+    backend_->OnDoomStart(entry_hash_);
   PostTaskAndReplyWithResult(
       worker_pool_, FROM_HERE,
       base::Bind(&SimpleSynchronousEntry::DoomEntry, path_, key_, entry_hash_),
-      base::Bind(&SimpleEntryImpl::DoomOperationComplete, this, callback,
-                 state_));
+      base::Bind(&SimpleEntryImpl::DoomOperationComplete,
+                 this, backend_, callback, state_));
   state_ = STATE_IO_PENDING;
 }
 
@@ -1069,10 +1071,14 @@ void SimpleEntryImpl::WriteOperationComplete(
       stream_index, completion_callback, *entry_stat, result.Pass());
 }
 
-void SimpleEntryImpl::DoomOperationComplete(const CompletionCallback& callback,
-                                            State state_to_restore,
-                                            int result) {
+void SimpleEntryImpl::DoomOperationComplete(
+    const base::WeakPtr<SimpleBackendImpl>& backend,
+    const CompletionCallback& callback,
+    State state_to_restore,
+    int result) {
   state_ = state_to_restore;
+  if (backend)
+    backend->OnDoomComplete(entry_hash_);
   if (!callback.is_null())
     callback.Run(result);
   RunNextOperationIfNeeded();