[sql] Add histogram tags to sync databases.

This allow tracking SQLite errors and other info in the wild.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/16987009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@206629 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 7 insertions, 0 deletions

diff --git a/sync/syncable/directory_backing_store.cc b/sync/syncable/directory_backing_store.cc
index 0f4e060..8bc7eac 100644
--- a/sync/syncable/directory_backing_store.cc
+++ b/sync/syncable/directory_backing_store.cc
@@ -155,6 +155,7 @@ DirectoryBackingStore::DirectoryBackingStore(const string& dir_name)
   : db_(new sql::Connection()),
     dir_name_(dir_name),
     needs_column_refresh_(false) {
+  db_->set_histogram_tag("SyncDirectory");
 }
 
 DirectoryBackingStore::DirectoryBackingStore(const string& dir_name,
diff --git a/sync/syncable/on_disk_directory_backing_store.cc b/sync/syncable/on_disk_directory_backing_store.cc
index e779a4c..08727c3 100644
--- a/sync/syncable/on_disk_directory_backing_store.cc
+++ b/sync/syncable/on_disk_directory_backing_store.cc
@@ -81,6 +81,12 @@ DirOpenResult OnDiskDirectoryBackingStore::Load(
   STLDeleteValues(handles_map);
   STLDeleteElements(delete_journals);
   db_.reset(new sql::Connection);
+  // TODO: Manually propagating the default database settings is
+  // brittle.  Either have a helper to set these up (or generate a new
+  // connection), or add something like Reset() to sql::Connection.
+  db_->set_exclusive_locking();
+  db_->set_page_size(4096);
+  db_->set_histogram_tag("SyncDirectory");
   file_util::Delete(backing_filepath_, false);
 
   result = TryLoad(handles_map, delete_journals, kernel_load_info);