Ensure WebAPK installation always records the app banner installation event.

chrome/browser/android/banners/app_banner_infobar_delegate_android.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/android/banners/app_banner_infobar_delegate_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/guid.h"
 #include "base/location.h"
@@ skipping 317 matching lines @@
 
   // If the WebAPK is not installed and the "Add to Home Screen" button is
   // clicked, install the WebAPK.
   install_state_ = INSTALLING;
   webapk::TrackInstallSource(webapk_install_source_);
 
   if (TriggeredFromBanner()) {
     TrackUserResponse(USER_RESPONSE_WEB_APP_ACCEPTED);
     AppBannerSettingsHelper::RecordBannerInstallEvent(
         web_contents, shortcut_info_->url.spec(), AppBannerSettingsHelper::WEB);
+  } else if (is_webapk_) {
+    // This branch will be entered if we are a WebAPK that was triggered from
+    // the add to homescreen menu item. Manually record the app banner added to
+    // homescreen event in this case. Don't call
+    // AppBannerSettingsHelper::RecordBannerInstallEvent as that records
+    // banner-specific metrics in addition to this event.
+    AppBannerSettingsHelper::RecordBannerEvent(
+        web_contents, web_contents->GetLastCommittedURL(),
+        shortcut_info_->url.spec(),
+        AppBannerSettingsHelper::APP_BANNER_EVENT_DID_ADD_TO_HOMESCREEN,
+        AppBannerManager::GetCurrentTime());
   }
 
   Java_AppBannerInfoBarDelegateAndroid_setWebApkInstallingState(
       env, java_delegate_, true);
   UpdateInstallState(env, nullptr);
   WebApkInstaller::FinishCallback callback =
       base::Bind(&AppBannerInfoBarDelegateAndroid::OnWebApkInstallFinished,
                   weak_ptr_factory_.GetWeakPtr());
   ShortcutHelper::InstallWebApkWithSkBitmap(web_contents->GetBrowserContext(),
                                             *shortcut_info_,
@@ skipping 112 matching lines @@
 
   TrackDismissEvent(DISMISS_EVENT_BANNER_CLICK);
   return true;
 }
 
 bool RegisterAppBannerInfoBarDelegateAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace banners