Initial translation event proto.

components/sync/protocol/user_event_specifics.proto

Index: components/sync/protocol/user_event_specifics.proto
diff --git a/components/sync/protocol/user_event_specifics.proto b/components/sync/protocol/user_event_specifics.proto
index d02b2833eb7ca9db5b8859bb587a5b799e961b5b..6982df8bd746ecdfb52f369363386d4ad31b0f5b 100644
--- a/components/sync/protocol/user_event_specifics.proto
+++ b/components/sync/protocol/user_event_specifics.proto
@@ -39,6 +39,30 @@ message LanguageDetection {
   optional string adopted_language = 2;
 }
 
+// User translated a page or interacted with translate suggestion.
+message Translation {
+  // Source language of the translation.
+  optional string from_language_code = 1;
+  // Target language of the translation.
+  optional string to_language_code = 2;
+  enum Interaction {

[napper, 2017/05/29 00:23:49]

You also need:

- never translate language
- never translate site
- always translate language
- translation reverted
- automatic translation

[renjieliu1, 2017/05/29 00:45:59]

Done.

+    UNKNOWN = 0;
+    ACCEPTED = 1;
+    REJECTED = 2;
+    // This happens when user scroll or click outside the UI without
+    // translation.
+    IGNORED = 3;
+    // This happens when user choose to close the translation window without
+    // translation.
+    DISMISSED = 4;
+    // User manually entered either language.
+    // In this case, from_language_code and to_language_code will be user chosen
+    // values.
+    MANUAL = 5;
+  }
+  optional Interaction interaction = 3;
+}
+
 message UserEventSpecifics {
   // Time of event, as measured on the client (unix epoch).
   optional int64 event_time_usec = 1;
@@ -53,5 +77,6 @@ message UserEventSpecifics {
   oneof event {
     FieldTrialEvent field_trial_event = 4;
     LanguageDetection language_detection = 5;
+    Translation translation = 6;
   }
 }