Move LanguageUsageMetrics and TranslateBrowserMetrics to components

LanguageUsageMetrics is moved to its own component because it is used
both in the translate component and directly in the browser.

TranslateBrowserMetrics is moved to the translate component.

BUG=331509
TBR=jochen

Review URL: https://codereview.chromium.org/131203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243946 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 75 insertions, 0 deletions

diff --git a/components/language_usage_metrics/language_usage_metrics.cc b/components/language_usage_metrics/language_usage_metrics.cc
new file mode 100644
index 0000000..adb91c9
--- /dev/null
+++ b/components/language_usage_metrics/language_usage_metrics.cc
@@ -0,0 +1,75 @@
+// Copyright 2014 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.
+
+#include "components/language_usage_metrics/language_usage_metrics.h"
+
+#include <algorithm>
+
+#include "base/metrics/sparse_histogram.h"
+#include "base/strings/string_tokenizer.h"
+#include "base/strings/string_util.h"
+
+namespace {
+void RecordAcceptLanguage(int language_code) {
+  UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.AcceptLanguage",
+                              language_code);
+}
+}  // namespace
+
+namespace language_usage_metrics {
+
+// static
+void LanguageUsageMetrics::RecordAcceptLanguages(
+    const std::string& accept_languages) {
+  std::set<int> languages;
+  ParseAcceptLanguages(accept_languages, &languages);
+  std::for_each(languages.begin(), languages.end(), RecordAcceptLanguage);
+}
+
+// static
+void LanguageUsageMetrics::RecordApplicationLanguage(
+    const std::string& application_locale) {
+  const int language_code = ToLanguageCode(application_locale);
+  if (language_code != 0)
+    UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.ApplicationLanguage",
+                                language_code);
+}
+
+// static
+int LanguageUsageMetrics::ToLanguageCode(const std::string& locale) {
+  base::StringTokenizer parts(locale, "-_");
+  if (!parts.GetNext())
+    return 0;
+
+  std::string language_part = parts.token();
+  StringToLowerASCII(&language_part);
+
+  int language_code = 0;
+  for (std::string::iterator it = language_part.begin();
+       it != language_part.end(); ++it) {
+    char ch = *it;
+    if (ch < 'a' || 'z' < ch)
+      return 0;
+
+    language_code <<= 8;
+    language_code += ch;
+  }
+
+  return language_code;
+}
+
+// static
+void LanguageUsageMetrics::ParseAcceptLanguages(
+    const std::string& accept_languages,
+    std::set<int>* languages) {
+  languages->clear();
+  base::StringTokenizer locales(accept_languages, ",");
+  while (locales.GetNext()) {
+    const int language_code = ToLanguageCode(locales.token());
+    if (language_code != 0)
+      languages->insert(language_code);
+  }
+}
+
+}  // namespace language_usage_metrics