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..9519c4501d9aa91ee77fb6b5aa233720464657e6 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.
+- (void)saveTranslationPolicy:(CWVTranslationPolicy*)policy

[Hiroshi Ichikawa, 2017/05/10 08:36:56]

1. Maybe "set" not "save" to be consistent with standard naming convention of
setters in Obj-C?
2. "language" is unclear, so how about "pageLanguage" instead?
3. Maybe add "for" to the selector to be consistent with
-translationPolicyForLanguage?

Putting all together, my suggestion is to change the selector to:
-setTranslationPolicy:forPageLanguage:

[jzw1, 2017/05/11 03:03:17]

Done.

+                     language:(CWVTranslationLanguage*)language;
+- (CWVTranslationPolicy*)translationPolicyForLanguage:
+    (CWVTranslationLanguage*)language;
+
+// Save or retrieve translation policies associated with a specified page.
+- (void)saveTranslationPolicy:(CWVTranslationPolicy*)policy

[Hiroshi Ichikawa, 2017/05/10 08:36:55]

1. Maybe "set" not "save" to be consistent with standard naming convention of
setters in Obj-C?
2. Maybe add "for" to the selector to be consistent with
-translationPolicyForLanguage?

Putting all together, my suggestion is to change the selector to:
-setTranslationPolicy:forPageHost:

[jzw1, 2017/05/11 03:03:17]

Done.

+                     pageHost:(NSString*)pageHost;
+- (CWVTranslationPolicy*)translationPolicyForPageHost:(NSString*)pageHost;
+
 @end
 
 NS_ASSUME_NONNULL_END