[translate] Add translate ranker model loader.

components/translate/core/common/translate_switches.cc

Index: components/translate/core/common/translate_switches.cc
diff --git a/components/translate/core/common/translate_switches.cc b/components/translate/core/common/translate_switches.cc
index 2a6da776977d33710cd79aa1db4e4f1d5aa03040..788ff201da3f6418a8a9507f1ab131760823e2f9 100644
--- a/components/translate/core/common/translate_switches.cc
+++ b/components/translate/core/common/translate_switches.cc
@@ -21,5 +21,7 @@ const char kTranslateSecurityOrigin[] = "translate-security-origin";
 // Overrides the URL from which the translate ranker model is downloaded.
 const char kTranslateRankerModelURL[] = "translate-ranker-model-url";
 
+// Overrides the path in which the translate ranker model is cached.
+const char kTranslateRankerModelPath[] = "translate-ranker-model-path";

[groby-ooo-7-16, 2017/01/23 21:41:57]

Do we really need this switch?

[Roger McFarlane (Chromium), 2017/02/08 23:08:13]

It was intended to allow for testing of a particular model file (by precluding
the download step). But, that would be the equivalent of specifying an
empty/invalid URL...

Removed.

 }  // namespace switches
 }  // namespace translate