Added translation policy API.

ios/web_view/public/cwv_translation_controller.h

Index: ios/web_view/public/cwv_translation_controller.h
diff --git a/ios/web_view/public/cwv_translation_controller.h b/ios/web_view/public/cwv_translation_controller.h
index 322965268cc4147208f1e96c33744d19d431d8fd..515ffd03c4021eb5942fc76419b7e4333a845a49 100644
--- a/ios/web_view/public/cwv_translation_controller.h
+++ b/ios/web_view/public/cwv_translation_controller.h
@@ -11,6 +11,7 @@
 NS_ASSUME_NONNULL_BEGIN
 
 @class CWVTranslationLanguage;
+@class CWVTranslationPolicy;
 @protocol CWVTranslationControllerDelegate;
 
 // The error domain for translation errors.
@@ -64,6 +65,17 @@ CWV_EXPORT
 // TODO(crbug.com/706289): Document what happens if you call this out of order.
 - (void)revertTranslation;
 
+// Save or retrieve translation policies associated with a specified language.

[Eugene But (OOO till 7-30), 2017/05/11 15:48:59]

Please explain pageLanguage in the comments.

Same for |pageHost|.

[Eugene But (OOO till 7-30), 2017/05/11 15:48:59]

/Save or retrieve/Sets or retrieves

Per Style Guide: "Use descriptive form ("Opens the file") rather than imperative
form ("Open the file") for method and function comments."
Same for the other comment.

[jzw1, 2017/05/12 03:46:46]

Done.

+- (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
+             forPageLanguage:(CWVTranslationLanguage*)pageLanguage;
+- (CWVTranslationPolicy*)translationPolicyForPageLanguage:
+    (CWVTranslationLanguage*)pageLanguage;
+
+// Save or retrieve translation policies associated with a specified page.
+- (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
+                 forPageHost:(NSString*)pageHost;
+- (CWVTranslationPolicy*)translationPolicyForPageHost:(NSString*)pageHost;
+
 @end
 
 NS_ASSUME_NONNULL_END