Record UMA statistics for file_stream operations.

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
new file mode 100644
index 0000000000000000000000000000000000000000..bbfe9d8916207566a97b7231458b93616363aa34
--- /dev/null
+++ b/net/base/file_stream_metrics.cc
@@ -0,0 +1,75 @@
+// Copyright (c) 2011 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/logging.h"
+#include "base/metrics/histogram.h"
+
+namespace net {
+
+namespace {
+
+void RecordFileErrorTypeCount(FileErrorSource source) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "Net.FileErrorType_Counts", source, FILE_ERROR_SOURCE_COUNT);
+}
+
+}  // namespace
+
+void RecordFileError(int error, FileErrorSource source, bool record) {
+  if (!record)
+    return;
+
+  RecordFileErrorTypeCount(source);
+
+  int bucket = GetErrorBucket(error);
+
+  static const int max_bucket = MaxBucket();  // Fixed value per platform.
+  static const int max_error = MaxError();  // Fixed value per platform.
+
+  switch(source) {
+    case FILE_ERROR_SOURCE_OPEN:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_Open", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_Open", bucket, max_bucket);
+      break;
+
+    case FILE_ERROR_SOURCE_WRITE:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_Write", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_Write", bucket, max_bucket);
+      break;
+
+    case FILE_ERROR_SOURCE_READ:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_Read", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_Read", bucket, max_bucket);
+      break;
+
+    case FILE_ERROR_SOURCE_SEEK:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_Seek", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_Seek", bucket, max_bucket);
+      break;
+
+    case FILE_ERROR_SOURCE_FLUSH:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_Flush", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_Flush", bucket, max_bucket);
+      break;
+
+    case FILE_ERROR_SOURCE_SET_EOF:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_SetEof", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_SetEof", bucket,
+                                max_bucket);
+      break;
+
+    case FILE_ERROR_SOURCE_GET_SIZE:
+      UMA_HISTOGRAM_ENUMERATION("Net.FileError_GetSize", error, max_error);
+      UMA_HISTOGRAM_ENUMERATION("Net.FileErrorRange_GetSize", bucket,
+                                max_bucket);
+      break;
+
+    default:
+      break;
+  }
+}
+
+}  // namespace net