[Translate] Integrate TranslateEventProto UMA logging into TranslateManager.

components/metrics/proto/translate_event.proto

Index: components/metrics/proto/translate_event.proto
diff --git a/components/metrics/proto/translate_event.proto b/components/metrics/proto/translate_event.proto
index 8dae1b0c01063fc26b7c52d330bfcd0a2b4da1d6..8bba508af402815bfa53938ad5a4be8fc4907fd5 100644
--- a/components/metrics/proto/translate_event.proto
+++ b/components/metrics/proto/translate_event.proto
@@ -111,6 +111,22 @@ message TranslateEventProto {
     // The translation was not offered because the URL is not
     // supported (e.g. New Tab Page).
     UNSUPPORTED_URL = 17;
+    // The previous page was in the same language, so the translate UI was
+    // suppressed.
+    MATCHES_PREVIOUS_LANGUAGE = 18;
+    // The translate UI was not shown because the browser window associated with
+    // the translate event has gone away.
+    BROWSER_WINDOW_IS_INVALID = 19;
+    // The translate UI was not shown because the browser window for the
+    // translate prompt is no longer active.
+    BROWSER_WINDOW_NOT_ACTIVE = 20;
+    // The translate UI was not shown because the browser window is minimized.
+    BROWSER_WINDOW_IS_MINIMIZED = 21;
+    // The translate UI was not shown because the web context for the translate
+    // prompt is no longer active.
+    WEB_CONTENTS_NOT_ACTIVE = 22;
+    // The translate UI was not shown because the user is editing a form field.
+    EDITABLE_FIELD_IS_ACTIVE = 23;
   }
 
   // Event received from translate UI.
@@ -131,4 +147,4 @@ message TranslateEventProto {
   // Modified target language, if the user changed it. If changed more than
   // once, we only keep the last one.
   optional string modified_target_language = 13;
-}
+}