Add a metrics extensions API....

chrome/browser/extensions/extension_metrics_module.h

+// Copyright (c) 2010 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_METRICS_MODULE_H__
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_METRICS_MODULE_H__
+
+#include <string>
+
+#include "base/histogram.h"
+#include "chrome/browser/extensions/extension_function.h"
+
+class MetricsRecordUserActionFunction : public SyncExtensionFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordUserAction")
+};
+
+class MetricsHistogramHelperFunction : public SyncExtensionFunction {
+ protected:
+  bool GetNameAndSample(std::string* name, int* sample);
+  virtual bool RecordValue(const std::string& name, Histogram::ClassType type,
+      int min, int max, size_t buckets, int sample);
+};
+
+class MetricsRecordValueFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordValue")
+};
+
+class MetricsRecordPercentageFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordPercentage")
+};
+
+class MetricsRecordCountFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordCount")
+};
+
+class MetricsRecordSmallCountFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordSmallCount")
+};
+
+class MetricsRecordMediumCountFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordMediumCount")
+};
+
+class MetricsRecordTimeFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordTime")
+};
+
+class MetricsRecordMediumTimeFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordMediumTime")
+};
+
+class MetricsRecordLongTimeFunction : public MetricsHistogramHelperFunction {
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("metrics.recordLongTime")
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_METRICS_MODULE_H__