Add support for user actions to the metrics library and the metrics clients.

metrics_library.cc

 // Copyright (c) 2010 The Chromium OS 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 "metrics_library.h"
 
 #include <errno.h>
 #include <sys/file.h>
 #include <sys/stat.h>
 
@@ skipping 203 matching lines @@
 }
 
 bool MetricsLibrary::SendToUMA(const string& name, int sample,
                                int min, int max, int nbuckets) {
   // Format the message.
   char message[kBufferSize];
   int32_t message_length =
       FormatChromeMessage(kBufferSize, message,
                           "histogram%c%s %d %d %d %d", '\0',
                           name.c_str(), sample, min, max, nbuckets);
-
   if (message_length < 0)
     return false;
 
   // Send the message.
   return SendMessageToChrome(message_length, message);
 }
 
 bool MetricsLibrary::SendEnumToUMA(const std::string& name, int sample,
                                    int max) {
   // Format the message.
   char message[kBufferSize];
   int32_t message_length =
       FormatChromeMessage(kBufferSize, message,
                           "linearhistogram%c%s %d %d", '\0',
                           name.c_str(), sample, max);
-
   if (message_length < 0)
     return false;
 
+  // Send the message.
+  return SendMessageToChrome(message_length, message);
+}
+
+bool MetricsLibrary::SendUserActionToUMA(const std::string& action) {
+  // Format the message.
+  char message[kBufferSize];
+  int32_t message_length =
+      FormatChromeMessage(kBufferSize, message,
+                          "useraction%c%s", '\0', action.c_str());
+  if (message_length < 0)
+    return false;
+
   // Send the message.
   return SendMessageToChrome(message_length, message);
 }