code: function fileOpened(filePath, addedToWorkingSet, encoding) {
          if (!shouldLogHealthData()) {
              return;
          }
          var fileExtension = FileUtils.getFileExtension(filePath),
              language = LanguageManager.getLanguageForPath(filePath),
              healthData = getStoredHealthData(),
              fileExtCountMap = [];
          healthData.fileStats = healthData.fileStats || {
              openedFileExt     : {},
              workingSetFileExt : {},
              openedFileEncoding: {}
          };
          if (language.getId() !== "unknown") {
              fileExtCountMap = addedToWorkingSet ? healthData.fileStats.workingSetFileExt : healthData.fileStats.openedFileExt;
              if (!fileExtCountMap[fileExtension]) {
                  fileExtCountMap[fileExtension] = 0;
              }
              fileExtCountMap[fileExtension]++;
              setHealthData(healthData);
          }
          if (encoding) {
              var fileEncCountMap = healthData.fileStats.openedFileEncoding;
              if (!fileEncCountMap) {
                  healthData.fileStats.openedFileEncoding = {};
                  fileEncCountMap = healthData.fileStats.openedFileEncoding;
              }
              if (!fileEncCountMap[encoding]) {
                  fileEncCountMap[encoding] = 0;
              }
              fileEncCountMap[encoding]++;
              setHealthData(healthData);
          }
  
  
          sendAnalyticsData(commonStrings.USAGE + commonStrings.FILE_OPEN + language._name,
                              commonStrings.USAGE,
                              commonStrings.FILE_OPEN,
                              language._name.toLowerCase()
                           );
  
      }
docs: Whenever a file is opened call this function. The function will record the number of times
  the standard file types have been opened. We only log the standard filetypes
  @param {String} filePath          The path of the file to be registered
  @param {boolean} addedToWorkingSet set to true if extensions of files added to the
  working set needs to be logged