Added UMA for usage of BudgetAPI calls.

chrome/browser/budget_service/budget_manager.h

Index: chrome/browser/budget_service/budget_manager.h
diff --git a/chrome/browser/budget_service/budget_manager.h b/chrome/browser/budget_service/budget_manager.h
index 99fa4fe2c9dea724a01c58b8980df6b1d63c3036..0f09631f7e8e5d253fb9ae0a2cb7209f6f90def1 100644
--- a/chrome/browser/budget_service/budget_manager.h
+++ b/chrome/browser/budget_service/budget_manager.h
@@ -63,14 +63,14 @@ class BudgetManager : public KeyedService {
  private:
   friend class BudgetManagerTest;
 
-  // Called as a callback from BudgetDatabase after it made a SpendBudget
-  // decision.
+  void DidGetBudget(const GetBudgetCallback& callback,
+                    blink::mojom::BudgetServiceErrorType error,
+                    std::vector<blink::mojom::BudgetStatePtr> budget);
+
   void DidConsume(const ConsumeCallback& callback,
                   blink::mojom::BudgetServiceErrorType error,
                   bool success);
 
-  // Called as a callback from BudgetDatabase after it has made a reserve
-  // decision.
   void DidReserve(const url::Origin& origin,
                   const ReserveCallback& callback,
                   blink::mojom::BudgetServiceErrorType error,