Added Net logging to FileStream.

net/base/file_stream_metrics.cc

Index: net/base/file_stream_metrics.cc
diff --git a/net/base/file_stream_metrics.cc b/net/base/file_stream_metrics.cc
index 7ffa96d66d6a6c1131f2a8aa5f1b325cfe0347ab..a167d6d90bc33f1687134dead8128d36748c3330 100644
--- a/net/base/file_stream_metrics.cc
+++ b/net/base/file_stream_metrics.cc
@@ -4,6 +4,7 @@
 
 #include "net/base/file_stream_metrics.h"
 
+#include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 
@@ -11,6 +12,21 @@ namespace net {
 
 namespace {
 
+const char* FileErrorSourceStrings[] = {
+  "OPEN",
+  "WRITE",
+  "READ",
+  "SEEK",
+  "FLUSH",
+  "SET_EOF",
+  "GET_SIZE",
+  "COUNT",
+};
+
+COMPILE_ASSERT(ARRAYSIZE_UNSAFE(FileErrorSourceStrings) ==
+                   FILE_ERROR_SOURCE_COUNT + 1,
+               file_error_source_enum_has_changed);
+
 void RecordFileErrorTypeCount(FileErrorSource source) {
   UMA_HISTOGRAM_ENUMERATION(
       "Net.FileErrorType_Counts", source, FILE_ERROR_SOURCE_COUNT);
@@ -78,4 +94,8 @@ void RecordFileError(int error, FileErrorSource source, bool record) {
   }
 }
 
+const char* GetFileErrorSourceName(FileErrorSource source) {
+  return FileErrorSourceStrings[source];
+}
+
 }  // namespace net