[Payments] Add PaymentRequest checkout funnel UKMs.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.payments;
 
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
@@ skipping 27 matching lines @@
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.EmptyTabModelObserver;
 import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver;
 import org.chromium.chrome.browser.tabmodel.TabModel;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabSelectionType;
 import org.chromium.chrome.browser.tabmodel.TabModelObserver;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.chrome.browser.tabmodel.TabModelSelectorObserver;
 import org.chromium.components.payments.CurrencyFormatter;
-import org.chromium.components.payments.JourneyLogger;
 import org.chromium.components.payments.PaymentValidator;
 import org.chromium.components.url_formatter.UrlFormatter;
 import org.chromium.content_public.browser.RenderFrameHost;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.browser.WebContentsStatics;
 import org.chromium.mojo.system.MojoException;
 import org.chromium.payments.mojom.CanMakePaymentQueryResult;
 import org.chromium.payments.mojom.PaymentComplete;
 import org.chromium.payments.mojom.PaymentDetails;
 import org.chromium.payments.mojom.PaymentDetailsModifier;
@@ skipping 315 matching lines @@
 
         mApps = new ArrayList<>();
 
         mAddressEditor = new AddressEditor();
         mCardEditor = new CardEditor(mWebContents, mAddressEditor, sObserverForTest);
 
         ChromeActivity activity = ChromeActivity.fromWebContents(mWebContents);
         mIsIncognito = activity != null && activity.getCurrentTabModel() != null
                 && activity.getCurrentTabModel().isIncognito();
 
-        mJourneyLogger = new JourneyLogger(mIsIncognito);
+        mJourneyLogger = new JourneyLogger(mIsIncognito, mOriginForDisplay);

[Mathieu, 2017/04/10 01:03:01]

I feel like we are tying two things that shouldn't be tied: displaying the URL,
and using it for UKM. What if one changes (e.g., we stop displaying the scheme)?
I would use mWebContents.getLastCommittedUrl() here

[sebsg, 2017/04/10 15:30:28]

Done.

 
         if (sCanMakePaymentQueries == null) sCanMakePaymentQueries = new ArrayMap<>();
 
         recordSuccessFunnelHistograms("Initiated");
     }
 
     @Override
     protected void finalize() throws Throwable {
         super.finalize();
         if (mCurrencyFormatter != null) {
@@ skipping 1292 matching lines @@
 
     /**
      * The frecency score is calculated according to use count and last use date. The formula is
      * the same as the one used in GetFrecencyScore in autofill_data_model.cc.
      */
     private static final double getFrecencyScore(int count, long date) {
         long currentTime = System.currentTimeMillis();
         return -Math.log((currentTime - date) / (24 * 60 * 60 * 1000) + 2) / Math.log(count + 2);
     }
 }