Extensions: Add metrics to distinguish between the different kinds of declarative API function call…

extensions/browser/api/declarative/declarative_api.h

Index: extensions/browser/api/declarative/declarative_api.h
diff --git a/extensions/browser/api/declarative/declarative_api.h b/extensions/browser/api/declarative/declarative_api.h
index 7f3b1a2dfe9018a697c806e05521da49afaa6eeb..aa68f6032387537304ae9366c91741c612955cbc 100644
--- a/extensions/browser/api/declarative/declarative_api.h
+++ b/extensions/browser/api/declarative/declarative_api.h
@@ -28,6 +28,9 @@ class RulesFunction : public AsyncExtensionFunction {
   // Returns false in case of errors.
   virtual bool RunAsyncOnCorrectThread() = 0;
 
+  // Records UMA metrics for the kind of declarative API call.
+  virtual void RecordUMA(const std::string& event_name) const = 0;
+
   scoped_refptr<RulesRegistry> rules_registry_;
 };
 
@@ -40,6 +43,7 @@ class EventsEventAddRulesFunction : public RulesFunction {
 
   // RulesFunction:
   bool RunAsyncOnCorrectThread() override;
+  void RecordUMA(const std::string& event_name) const override;
 };
 
 class EventsEventRemoveRulesFunction : public RulesFunction {
@@ -51,6 +55,7 @@ class EventsEventRemoveRulesFunction : public RulesFunction {
 
   // RulesFunction:
   bool RunAsyncOnCorrectThread() override;
+  void RecordUMA(const std::string& event_name) const override;
 };
 
 class EventsEventGetRulesFunction : public RulesFunction {
@@ -62,6 +67,7 @@ class EventsEventGetRulesFunction : public RulesFunction {
 
   // RulesFunction:
   bool RunAsyncOnCorrectThread() override;
+  void RecordUMA(const std::string& event_name) const override;
 };
 
 }  // namespace extensions