Add GetStoreSize() to ImageStore to know the actual db size.

components/enhanced_bookmarks/persistent_image_store.cc

Index: components/enhanced_bookmarks/persistent_image_store.cc
diff --git a/components/enhanced_bookmarks/persistent_image_store.cc b/components/enhanced_bookmarks/persistent_image_store.cc
index 5e42f3528aa8e3358d36b25b099999397b8b4fc3..73d920433c4b1f6cb4f1e5dcdba5bd1ffd3df67e 100644
--- a/components/enhanced_bookmarks/persistent_image_store.cc
+++ b/components/enhanced_bookmarks/persistent_image_store.cc
@@ -4,6 +4,7 @@
 
 #include "components/enhanced_bookmarks/persistent_image_store.h"
 
+#include "base/files/file.h"
 #include "components/enhanced_bookmarks/image_store_util.h"
 #include "sql/statement.h"
 #include "sql/transaction.h"
@@ -197,6 +198,15 @@ void PersistentImageStore::ClearAll() {
   statement.Run();
 }
 
+int64 PersistentImageStore::GetStoreSize() {
+  // Ensure that the db is actually valid.
+  if (OpenDatabase() != sql::INIT_OK)

[sky, 2014/05/29 21:51:05]

Do you really need to open the db here?

[Kibeom Kim (inactive), 2014/05/29 23:07:15]

Done.

+    return -1;
+
+  return base::File(path_, base::File::FLAG_OPEN | base::File::FLAG_READ).
+      GetLength();
+}
+
 PersistentImageStore::~PersistentImageStore() {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 }