Extending the UserClassifier to actually support classification.

chrome/browser/android/ntp/ntp_snippets_bridge.cc

Index: chrome/browser/android/ntp/ntp_snippets_bridge.cc
diff --git a/chrome/browser/android/ntp/ntp_snippets_bridge.cc b/chrome/browser/android/ntp/ntp_snippets_bridge.cc
index 348e5e95402663c4490ef19e4cd3896e48749ee9..0c830932095664650c0177fa54eeb4f94e509a13 100644
--- a/chrome/browser/android/ntp/ntp_snippets_bridge.cc
+++ b/chrome/browser/android/ntp/ntp_snippets_bridge.cc
@@ -268,7 +268,8 @@ void NTPSnippetsBridge::OnPageShown(
                        suggestions_per_category_int[i]));
   }
   ntp_snippets::metrics::OnPageShown(suggestions_per_category);
-  content_suggestions_service_->user_classifier()->OnNTPOpened();
+  content_suggestions_service_->user_classifier()->OnEvent(
+      ntp_snippets::UserClassifier::Metric::NTP_OPENED);
 }
 
 void NTPSnippetsBridge::OnSuggestionShown(JNIEnv* env,
@@ -281,8 +282,10 @@ void NTPSnippetsBridge::OnSuggestionShown(JNIEnv* env,
   ntp_snippets::metrics::OnSuggestionShown(
       global_position, CategoryFromIDValue(category), category_position,
       TimeFromJavaTime(publish_timestamp_ms), score);
-  if (global_position == 0)
-    content_suggestions_service_->user_classifier()->OnSuggestionsShown();
+  if (global_position == 0) {
+    content_suggestions_service_->user_classifier()->OnEvent(
+        ntp_snippets::UserClassifier::Metric::SUGGESTIONS_SHOWN);
+  }
 }
 
 void NTPSnippetsBridge::OnSuggestionOpened(JNIEnv* env,
@@ -297,7 +300,8 @@ void NTPSnippetsBridge::OnSuggestionOpened(JNIEnv* env,
       global_position, CategoryFromIDValue(category), category_position,
       TimeFromJavaTime(publish_timestamp_ms), score,
       static_cast<WindowOpenDisposition>(windowOpenDisposition));
-  content_suggestions_service_->user_classifier()->OnSuggestionsUsed();
+  content_suggestions_service_->user_classifier()->OnEvent(
+      ntp_snippets::UserClassifier::Metric::SUGGESTIONS_USED);
 }
 
 void NTPSnippetsBridge::OnSuggestionMenuOpened(JNIEnv* env,
@@ -326,7 +330,8 @@ void NTPSnippetsBridge::OnMoreButtonClicked(JNIEnv* env,
                                             jint position) {
   ntp_snippets::metrics::OnMoreButtonClicked(CategoryFromIDValue(category),
                                              position);
-  content_suggestions_service_->user_classifier()->OnSuggestionsUsed();
+  content_suggestions_service_->user_classifier()->OnEvent(
+      ntp_snippets::UserClassifier::Metric::SUGGESTIONS_USED);
 }
 
 NTPSnippetsBridge::~NTPSnippetsBridge() {}