Receive app notifications in SimpleCache, so we save our index file

net/disk_cache/simple/simple_index.h

Index: net/disk_cache/simple/simple_index.h
diff --git a/net/disk_cache/simple/simple_index.h b/net/disk_cache/simple/simple_index.h
index 4f3c4046daa7c3f2989f3752d8767272d8ea86ef..d6ed5757f9f9e4fe6ae3351b7acc9a4d1e293fa9 100644
--- a/net/disk_cache/simple/simple_index.h
+++ b/net/disk_cache/simple/simple_index.h
@@ -22,6 +22,10 @@
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 
+#if defined(OS_ANDROID)
+#include "net/android/simple_cache_activity_status_notifier.h"
+#endif
+
 class Pickle;
 class PickleIterator;
 
@@ -142,6 +146,8 @@ class NET_EXPORT_PRIVATE SimpleIndex
   void MergeInitializingSet(scoped_ptr<EntrySet> index_file_entries,
                             bool force_index_flush);
 
+  void ActivityStatusChanged(int activity_status);

[gavinp, 2013/04/19 15:58:55]

I'm not a fan of moving the activity_status around in an int. Why did you choose
this vs an enum? To avoid having the mapping defined in the object in
net/android? To avoid a larger #if defined() region?

[felipeg, 2013/04/19 17:10:15]

lets do the enum

+
   EntrySet entries_set_;
   uint64 cache_size_;  // Total cache storage size in bytes.
 
@@ -162,11 +168,15 @@ class NET_EXPORT_PRIVATE SimpleIndex
   // Timestamp of the last time we wrote the index to disk.
   // PostponeWritingToDisk() may give up postponing and allow the write if it
   // has been a while since last time we wrote.
-  base::Time last_write_to_disk_;
   base::OneShotTimer<SimpleIndex> write_to_disk_timer_;
 
   typedef std::list<net::CompletionCallback> CallbackList;
   CallbackList to_run_when_initialized_;
+
+#if defined(OS_ANDROID)
+  net::SimpleCacheActivityStatusNotifier activity_status_notifier_;
+#endif
+  bool app_on_background_;
 };
 
 }  // namespace disk_cache