Refine UMA stats for file system databases.

webkit/fileapi/file_system_directory_database.cc

Index: webkit/fileapi/file_system_directory_database.cc
diff --git a/webkit/fileapi/file_system_directory_database.cc b/webkit/fileapi/file_system_directory_database.cc
index 6eb1df9567d42a6126b7af8d932938d048af22a5..c25e006a2f56ea51bc318035d89729e6056dc371 100644
--- a/webkit/fileapi/file_system_directory_database.cc
+++ b/webkit/fileapi/file_system_directory_database.cc
@@ -74,6 +74,8 @@ const char kInitStatusHistogramLabel[] = "FileSystem.DirectoryDatabaseInit";
 enum InitStatus {
   INIT_STATUS_OK = 0,
   INIT_STATUS_CORRUPTION,
+  INIT_STATUS_IO_ERROR,
+  INIT_STATUS_UNKNOWN_ERROR,
   INIT_STATUS_MAX
 };
 
@@ -444,9 +446,15 @@ void FileSystemDirectoryDatabase::ReportInitStatus(
   if (status.ok()) {
     UMA_HISTOGRAM_ENUMERATION(kInitStatusHistogramLabel,
                               INIT_STATUS_OK, INIT_STATUS_MAX);
-  } else {
+  } else if (status.IsCorruption()) {
     UMA_HISTOGRAM_ENUMERATION(kInitStatusHistogramLabel,
                               INIT_STATUS_CORRUPTION, INIT_STATUS_MAX);
+  } else if (status.IsIOError()) {
+    UMA_HISTOGRAM_ENUMERATION(kInitStatusHistogramLabel,
+                              INIT_STATUS_IO_ERROR, INIT_STATUS_MAX);
+  } else {
+    UMA_HISTOGRAM_ENUMERATION(kInitStatusHistogramLabel,
+                              INIT_STATUS_UNKNOWN_ERROR, INIT_STATUS_MAX);
   }
 }