PaymentRequest.abort() should return a promise.

chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
index 4e55ca2236ca7355cf2699a18eb05d050e86b6ae..53a8a0cee4e7e21abd014c53de0c1bd57c823757 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
@@ -114,6 +114,7 @@ public class PaymentRequestImpl implements PaymentRequest, PaymentRequestUI.Clie
     private Callback<PaymentInformation> mPaymentInformationCallback;
     private Pattern mRegionCodePattern;
     private boolean mMerchantNeedsShippingAddress;
+    private boolean mPaymentAppRunning;
 
     /**
      * Builds the dialog.
@@ -556,6 +557,7 @@ public class PaymentRequestImpl implements PaymentRequest, PaymentRequestUI.Clie
             PaymentOption selectedShippingOption, PaymentOption selectedPaymentMethod) {
         assert selectedPaymentMethod instanceof PaymentInstrument;
         PaymentInstrument instrument = (PaymentInstrument) selectedPaymentMethod;
+        mPaymentAppRunning = true;
         instrument.getDetails(mMerchantName, mOrigin, mRawTotal, mRawLineItems,
                 mData.optJSONObject(instrument.getMethodName()), this);
     }
@@ -576,8 +578,11 @@ public class PaymentRequestImpl implements PaymentRequest, PaymentRequestUI.Clie
      */
     @Override
     public void abort() {
-        closeClient();
-        closeUI(false);
+        mClient.onAbort(!mPaymentAppRunning);
+        if (!mPaymentAppRunning) {
+            closeClient();
+            closeUI(false);
+        }
     }
 
     /**