Added Net logging to FileStream.

net/base/file_stream_metrics.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/file_stream_metrics.h"
 
+#include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 
 namespace net {
 
 namespace {
 
+const char* FileErrorSourceStrings[] = {
+  "OPEN",
+  "WRITE",
+  "READ",
+  "SEEK",
+  "FLUSH",
+  "SET_EOF",
+  "GET_SIZE"
+};
+
+COMPILE_ASSERT(ARRAYSIZE_UNSAFE(FileErrorSourceStrings) ==
+                   FILE_ERROR_SOURCE_COUNT,
+               file_error_source_enum_has_changed);
+
 void RecordFileErrorTypeCount(FileErrorSource source) {
   UMA_HISTOGRAM_ENUMERATION(
       "Net.FileErrorType_Counts", source, FILE_ERROR_SOURCE_COUNT);
 }
 
 }  // namespace
 
 void RecordFileError(int error, FileErrorSource source, bool record) {
   LOG(ERROR) << " " << __FUNCTION__ << "()"
              << " error = " << error
@@ skipping 47 matching lines @@
       UMA_HISTOGRAM_ENUMERATION("Net.FileError_GetSize", error, max_error);
       UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_GetSize", bucket,
                                 max_bucket);
       break;
 
     default:
       break;
   }
 }
 
+const char* GetFileErrorSourceName(FileErrorSource source) {
+  DCHECK_NE(FILE_ERROR_SOURCE_COUNT, source);
+  return FileErrorSourceStrings[source];
+}
+
 }  // namespace net