Add some basic success/failure UMA logging for autofill.

chrome/browser/autofill/autofill_metrics.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_AUTOFILL_AUTOFILL_METRICS_H_
 #define CHROME_BROWSER_AUTOFILL_AUTOFILL_METRICS_H_
 #pragma once
 
-namespace autofill_metrics {
+#include "base/basictypes.h"
 
-// Each of these should be logged at most once per query to the server, which in
-// turn should occur at most once per page load.
-enum ServerQueryMetricType {
-  // Logged for each query sent to the server
-  QUERY_SENT = 0,
-  // Logged for each query response received from the server
-  QUERY_RESPONSE_RECEIVED,
-  // Logged for each parsable response received from the server
-  QUERY_RESPONSE_PARSED,
-  // Logged for each parsable response that provided no improvements relative to
-  // our heuristics.
-  QUERY_RESPONSE_MATCHED_LOCAL_HEURISTICS,
-  // Logged for each page for which our heuristics detected at least one
-  // auto-fillable field, but the server response overrode the type of at least
-  // one field
-  QUERY_RESPONSE_OVERRODE_LOCAL_HEURISTICS,
-  // Logged for each page for which our heuristics did not detect any
-  // auto-fillable fields, but the server response did detect some.
-  QUERY_RESPONSE_WITH_NO_LOCAL_HEURISTICS,
-  NUM_SERVER_QUERY_METRICS
+class AutoFillMetrics {
+ public:
+  // Each of these is logged at most once per query to the server, which in turn
+  // occurs at most once per page load.
+  enum ServerQueryMetric {
+    // Logged for each query sent to the server.
+    QUERY_SENT = 0,
+    // Logged for each query response received from the server.
+    QUERY_RESPONSE_RECEIVED,
+    // Logged for each parsable response received from the server.
+    QUERY_RESPONSE_PARSED,
+    // Logged for each parsable response that provided no improvements relative
+    // to our heuristics.
+    QUERY_RESPONSE_MATCHED_LOCAL_HEURISTICS,
+    // Logged for each page for which our heuristics detected at least one
+    // auto-fillable field, but the server response overrode the type of at
+    // least one field.
+    QUERY_RESPONSE_OVERRODE_LOCAL_HEURISTICS,
+    // Logged for each page for which our heuristics did not detect any
+    // auto-fillable fields, but the server response did detect some.
+    QUERY_RESPONSE_WITH_NO_LOCAL_HEURISTICS,
+    NUM_SERVER_QUERY_METRICS
+  };
+
+  // Each of these is logged at most once per form submission.
+  enum QualityMetric {
+    // Logged for each field in a submitted form.
+    FIELD_SUBMITTED = 0,
+    // A simple successs metric, logged for each field that returns true for
+    // |is_autofilled()| and has a value that is present in the personal data
+    // manager. There is a small chance of false positives from filling via
+    // autocomplete rather than autofill.
+    FIELD_AUTOFILLED,
+    // A simple failure metric, logged for each field that returns false for
+    // |is_autofilled()| but as a value that is present in the personal data
+    // manager.
+    FIELD_AUTOFILL_FAILED,
+    NUM_QUALITY_METRICS
+  };
+
+  AutoFillMetrics();
+  virtual ~AutoFillMetrics();
+
+  virtual void Log(ServerQueryMetric metric) const;
+  virtual void Log(QualityMetric metric) const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AutoFillMetrics);
 };
 
-void LogServerQueryMetric(ServerQueryMetricType type);
-
-}  // namespace autofill_metrics
-
 #endif  // CHROME_BROWSER_AUTOFILL_AUTOFILL_METRICS_H_