Move language detection to a component

chrome/common/translate/translate_common_metrics.h

-// Copyright 2013 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_COMMON_TRANSLATE_TRANSLATE_COMMON_METRICS_H_
-#define CHROME_COMMON_TRANSLATE_TRANSLATE_COMMON_METRICS_H_
-
-#include <string>
-
-#include "base/time/time.h"
-
-namespace TranslateCommonMetrics {
-
-// An indexing type to query each UMA entry name via GetMetricsName() function.
-// Note: |kMetricsEntries| should be updated when a new entry is added here.
-enum MetricsNameIndex {
-  UMA_LANGUAGE_DETECTION,
-  UMA_CONTENT_LANGUAGE,
-  UMA_HTML_LANG,
-  UMA_LANGUAGE_VERIFICATION,
-  UMA_TIME_TO_BE_READY,
-  UMA_TIME_TO_LOAD,
-  UMA_TIME_TO_TRANSLATE,
-  UMA_USER_ACTION_DURATION,
-  UMA_PAGE_SCHEME,
-  UMA_SIMILAR_LANGUAGE_MATCH,
-  UMA_MAX,
-};
-
-// A page may provide a Content-Language HTTP header or a META tag.
-// TranslateHelper checks if a server provides a valid Content-Language.
-enum LanguageCheckType {
-  LANGUAGE_NOT_PROVIDED,
-  LANGUAGE_VALID,
-  LANGUAGE_INVALID,
-  LANGUAGE_MAX,
-};
-
-// When a valid Content-Language is provided, TranslateHelper checks if a
-// server provided Content-Language matches to a language CLD determined.
-enum LanguageVerificationType {
-  LANGUAGE_VERIFICATION_CLD_DISABLED,  // obsolete
-  LANGUAGE_VERIFICATION_CLD_ONLY,
-  LANGUAGE_VERIFICATION_UNKNOWN,
-  LANGUAGE_VERIFICATION_CLD_AGREE,
-  LANGUAGE_VERIFICATION_CLD_DISAGREE,
-  LANGUAGE_VERIFICATION_TRUST_CLD,
-  LANGUAGE_VERIFICATION_CLD_COMPLEMENT_SUB_CODE,
-  LANGUAGE_VERIFICATION_MAX,
-};
-
-// Scheme type of pages Chrome is going to translate.
-enum SchemeType {
-  SCHEME_HTTP,
-  SCHEME_HTTPS,
-  SCHEME_OTHERS,
-  SCHEME_MAX,
-};
-
-// Called after TranslateHelper verifies a server providing Content-Language
-// header. |provided_code| contains a Content-Language header value which a
-// server provides. It can be empty string when a server doesn't provide it.
-// |revised_code| is a value modified by format error corrector.
-void ReportContentLanguage(const std::string& provided_code,
-                           const std::string& revised_code);
-
-// Called after TranslateHelper verifies a page providing html lang attribute.
-// |provided_code| contains a html lang attribute which a page provides. It can
-// be empty string when a page doesn't provide it. |revised_code| is a value
-// modified by format error corrector.
-void ReportHtmlLang(const std::string& provided_code,
-                    const std::string& revised_code);
-
-// Called when CLD verifies Content-Language header.
-void ReportLanguageVerification(LanguageVerificationType type);
-
-// Called when the Translate Element library is ready.
-void ReportTimeToBeReady(double time_in_msec);
-
-// Called when the Translate Element library is loaded.
-void ReportTimeToLoad(double time_in_msec);
-
-// Called when a page translation is finished.
-void ReportTimeToTranslate(double time_in_msec);
-
-// Called when a translation is triggered.
-void ReportUserActionDuration(base::TimeTicks begin, base::TimeTicks end);
-
-// Called when a translation is triggered.
-void ReportPageScheme(const std::string& scheme);
-
-// Called when CLD detects page language.
-void ReportLanguageDetectionTime(base::TimeTicks begin, base::TimeTicks end);
-
-// Called when CLD agreed on a language which is different, but in the similar
-// language list.
-void ReportSimilarLanguageMatch(bool match);
-
-// Gets UMA name for an entry specified by |index|.
-const char* GetMetricsName(MetricsNameIndex index);
-
-}  // namespace TranslateCommonMetrics
-
-#endif  // CHROME_COMMON_TRANSLATE_TRANSLATE_COMMON_METRICS_H_