Start transition the metrics library to non-static API. Use gmock in tests.

src/platform/metrics/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.
 
 /*
  * metrics_library.cc
  *
  *  Created on: Dec 1, 2009
  *      Author: sosa
  */
@@ skipping 103 matching lines @@
   if (message_length > buffer_size) {
     PrintError("chrome message too long", NULL, 0);
     return -1;
   }
 
   // Prepend LENGTH to the message.
   memcpy(buffer, &message_length, len_size);
   return message_length;
 }
 
+void MetricsLibrary::Init() {
+}
+
 // static
 bool MetricsLibrary::SendToAutotest(const string& name, int value) {
   FILE *autotest_file = fopen(kAutotestPath, "a+");
   if (autotest_file == NULL) {
     PrintError("fopen", kAutotestPath, errno);
     return false;
   }
 
   fprintf(autotest_file, "%s=%d\n", name.c_str(), value);
   fclose(autotest_file);
@@ skipping 10 matching lines @@
                           "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::SendToUMA(const string& name, int sample,
+                               int min, int max, int nbuckets) {
+  return SendToChrome(name, sample, min, max, nbuckets);
+}
+
 //static
 bool MetricsLibrary::SendEnumToChrome(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::SendEnumToUMA(const std::string& name, int sample,
+                                   int max) {
+  return SendEnumToChrome(name, sample, max);
+}