Refactor language detection logic to allow non-static CLD data sources.

components/translate/content/browser/browser_cld_data_provider_factory.h

+// 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.
+
+#ifndef COMPONENTS_TRANSLATE_CONTENT_BROWSER_BROWSER_CLD_DATA_PROVIDER_FACTORY_H_
+#define COMPONENTS_TRANSLATE_CONTENT_BROWSER_BROWSER_CLD_DATA_PROVIDER_FACTORY_H_
+
+#include "components/translate/content/browser/browser_cld_data_provider.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace translate {
+
+class BrowserCldDataProviderFactory {
+ public:
+  BrowserCldDataProviderFactory();
+  virtual ~BrowserCldDataProviderFactory();
+  virtual BrowserCldDataProvider* NewProvider(
+      content::WebContents* web_contents);
+
+  // Returns true if and only if the current instance for this process is not
+  // NULL.
+  static bool IsInitialized();
+
+  // Sets the instance of the factory used by this process, optionally
+  // overwriting the previous value. Embedders and narrow use-cases (such as
+  // shells and test code) should use the overwrite capability, while generic
+  // code should not.
+  static void Set(BrowserCldDataProviderFactory* instance, bool overwrite);
+
+  // Returns the instance of the provider previously set by Set(...).
+  // If no instance has been set, a default no-op provider will be returned.
+  static BrowserCldDataProviderFactory* Get();
+};
+
+}  // namespace translate
+
+#endif  // COMPONENTS_TRANSLATE_CONTENT_BROWSER_BROWSER_CLD_DATA_PROVIDER_FACTORY_H_