Add metrics for permission prompt acceptance / denial

chrome/browser/permissions/permission_uma_util.h

Index: chrome/browser/permissions/permission_uma_util.h
diff --git a/chrome/browser/permissions/permission_uma_util.h b/chrome/browser/permissions/permission_uma_util.h
index c4c8001d215749510c9f390aad526442da0db199..438368e3cd4971ecedc83b2442019ebed246623d 100644
--- a/chrome/browser/permissions/permission_uma_util.h
+++ b/chrome/browser/permissions/permission_uma_util.h
@@ -65,6 +65,18 @@ class PermissionUmaUtil {
   static void PermissionPromptShown(
       const std::vector<PermissionBubbleRequest*>& requests);
 
+  // The following two functions can be combined with the PermissionPromptShown
+  // metrics to calculate accept, deny and ignore rates.
+  // Note that for coalesced permission bubbles, PermissionPromptAccepted will
+  // always be called, with |accept_states| containing whether each request was
+  // accepted or denied.
+  static void PermissionPromptAccepted(
+      const std::vector<PermissionBubbleRequest*>& requests,
+      const std::vector<bool>& accept_states);
+
+  static void PermissionPromptDenied(
+      const std::vector<PermissionBubbleRequest*>& requests);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PermissionUmaUtil);
 };