Pass multiple transactions at the same time

This follows the design of SKPayment API.

atom/browser/api/atom_api_in_app_purchase.cc

@@ -82,9 +82,9 @@ void InAppPurchase::PurchaseProduct(const std::string& product_id,
   in_app_purchase::PurchaseProduct(product_id, quantity, callback);
 }
 
-void InAppPurchase::OnTransactionUpdated(
-    const in_app_purchase::Transaction& transaction) {
-  Emit("transaction-updated", transaction);
+void InAppPurchase::OnTransactionsUpdated(
+    const std::vector<in_app_purchase::Transaction>& transactions) {
+  Emit("transactions-updated", transactions);
 }
 
 }  // namespace api

atom/browser/api/atom_api_in_app_purchase.h

@@ -6,6 +6,7 @@
 #define ATOM_BROWSER_API_ATOM_API_IN_APP_PURCHASE_H_
 
 #include <string>
+#include <vector>
 
 #include "atom/browser/api/event_emitter.h"
 #include "atom/browser/mac/in_app_purchase.h"
@@ -31,8 +32,8 @@ class InAppPurchase: public mate::EventEmitter<InAppPurchase>,
   void PurchaseProduct(const std::string& product_id, mate::Arguments* args);
 
   // TransactionObserver:
-  void OnTransactionUpdated(
-      const in_app_purchase::Transaction& transaction) override;
+  void OnTransactionsUpdated(
+      const std::vector<in_app_purchase::Transaction>& transactions) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InAppPurchase);

atom/browser/mac/in_app_purchase_observer.h

@@ -6,6 +6,7 @@
 #define ATOM_BROWSER_MAC_IN_APP_PURCHASE_OBSERVER_H_
 
 #include <string>
+#include <vector>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
@@ -14,7 +15,7 @@
 @class InAppTransactionObserver;
 #else  // __OBJC__
 class InAppTransactionObserver;
-#endif // __OBJC__
+#endif  // __OBJC__
 
 namespace in_app_purchase {
 
@@ -42,7 +43,8 @@ class TransactionObserver {
   TransactionObserver();
   virtual ~TransactionObserver();
 
-  virtual void OnTransactionUpdated(const Transaction& transaction) = 0;
+  virtual void OnTransactionsUpdated(
+      const std::vector<Transaction>& transactions) = 0;
 
  private:
   InAppTransactionObserver* obeserver_;

atom/browser/mac/in_app_purchase_observer.mm

@@ -18,7 +18,8 @@
 namespace {
 
 using InAppTransactionCallback =
-    base::RepeatingCallback<void(const in_app_purchase::Transaction&)>;
+    base::RepeatingCallback<
+        void(const std::vector<in_app_purchase::Transaction>&)>;
 
 }  // namespace
 
@@ -54,19 +55,17 @@ using InAppTransactionCallback =
  *
  * @param transaction - The transaction to pass to the callback.
  */
-- (void)runCallback:(SKPaymentTransaction*)transaction {
-  if (transaction == nil) {
-    return;
-  }
-
+- (void)runCallback:(NSArray<SKPaymentTransaction*>*)transactions {
   // Convert the transaction.
-  in_app_purchase::Transaction transactionStruct;
-  transactionStruct = [self skPaymentTransactionToStruct:transaction];
+  std::vector<in_app_purchase::Transaction> converted;
+  converted.reserve([transactions count]);
+  for (SKPaymentTransaction* transaction in transactions) {
+    converted.push_back([self skPaymentTransactionToStruct:transaction]);
+  }
 
   // Send the callback to the browser thread.
   content::BrowserThread::PostTask(
-      content::BrowserThread::UI, FROM_HERE,
-      base::Bind(callback_, transactionStruct));
+      content::BrowserThread::UI, FROM_HERE, base::Bind(callback_, converted));
 }
 
 /**
@@ -157,9 +156,7 @@ using InAppTransactionCallback =
  */
 - (void)paymentQueue:(SKPaymentQueue*)queue
     updatedTransactions:(NSArray*)transactions {
-  for (SKPaymentTransaction* transaction in transactions) {
-    [self runCallback:transaction];
-  }
+  [self runCallback:transactions];
 }
 
 @end
@@ -172,7 +169,7 @@ namespace in_app_purchase {
 
 TransactionObserver::TransactionObserver() : weak_ptr_factory_(this) {
   obeserver_ = [[InAppTransactionObserver alloc]
-     initWithCallback:base::Bind(&TransactionObserver::OnTransactionUpdated,
+     initWithCallback:base::Bind(&TransactionObserver::OnTransactionsUpdated,
                                  weak_ptr_factory_.GetWeakPtr())];
 }
 

docs/api/in-app-purchase.md

@@ -8,23 +8,14 @@ Process: [Main](../glossary.md#main-process)
 
 The `inAppPurchase` module emits the following events:
 
-### Event: 'transaction-updated'
+### Event: 'transactions-updated'
 
-Emitted when a transaction has been updated.
+Emitted when one or more transactions have been updated.
 
 Returns:
 
 * `event` Event
-* `transaction` Object
-  * `transactionIdentifier` String
-  * `transactionDate` String
-  * `originalTransactionIdentifier` String
-  * `transactionState` String - The transaction sate (`"purchasing"`, `"purchased"`, `"failed"`, `"restored"`, or `"deferred"`)
-  * `errorCode` Integer
-  * `errorMessage` String
-  * `payment` Object
-    * `productIdentifier` String
-    * `quantity` Integer
+* `transactions` ([Transaction[]](structures/transaction.md) - Array of transactions.
 
 ## Methods
 

docs/api/structures/transaction.md

@@ -0,0 +1,11 @@
+# Transaction Object
+
+* `transactionIdentifier` String
+* `transactionDate` String
+* `originalTransactionIdentifier` String
+* `transactionState` String - The transaction sate (`"purchasing"`, `"purchased"`, `"failed"`, `"restored"`, or `"deferred"`)
+* `errorCode` Integer
+* `errorMessage` String
+* `payment` Object
+  * `productIdentifier` String
+  * `quantity` Integer