Add WebAPK installation metrics.

chrome/browser/android/banners/app_banner_infobar_delegate_android.cc

Index: chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
diff --git a/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc b/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
index 24b1523948bec8f5c58a8083c549c6c793d37c5c..e9fe2be1ee8cfda6284fca862f48283c9d33ced6 100644
--- a/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
+++ b/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
@@ -43,8 +43,17 @@ bool IsInfoEmpty(const ShortcutInfo* info) {
   return !info || info->url.is_empty();
 }
 
+void TrackWebApkInstallationDismissEvents(webapk::InstallState install_state) {
+  if (install_state == webapk::WAIT_FOR_START)
+    webapk::TrackInstallEvent(webapk::INSTALL_EVENT_ADD_TO_HOME_SCREEN_DISMISS);
+  else if (install_state == webapk::INSTALLING)
+    webapk::TrackInstallEvent(webapk::INSTALL_EVENT_ADDING_DISMISS);
+  else if (install_state == webapk::INSTALLED)
+    webapk::TrackUserAction(webapk::USER_ACTION_INSTALLED_OPEN_DISMISS);
 }
 
+}  // namespace
+
 namespace banners {
 
 // static
@@ -69,8 +78,14 @@ bool AppBannerInfoBarDelegateAndroid::Create(
            ->AddInfoBar(std::move(infobar)))
     return false;
 
-  if (is_webapk && start_install_webapk)
-    raw_delegate->AcceptWebApk(web_contents);
+  if (is_webapk) {
+    if (start_install_webapk) {
+      raw_delegate->AcceptWebApk(web_contents);
+      webapk::TrackStartType(webapk::STARTED_FROM_ADD_TO_HOME_SCREEN_MENU);
+    } else {
+      webapk::TrackStartType(webapk::TRIGGERED_FROM_BANNER);
+    }
+  }
 
   return true;
 }
@@ -96,10 +111,13 @@ AppBannerInfoBarDelegateAndroid::~AppBannerInfoBarDelegateAndroid() {
   weak_ptr_factory_.InvalidateWeakPtrs();
 
   if (!has_user_interaction_) {
-    if (!native_app_data_.is_null())
+    if (!native_app_data_.is_null()) {
       TrackUserResponse(USER_RESPONSE_NATIVE_APP_IGNORED);
-    else if (!IsInfoEmpty(shortcut_info_.get()))
+    } else if (!IsInfoEmpty(shortcut_info_.get())) {
       TrackUserResponse(USER_RESPONSE_WEB_APP_IGNORED);
+      if (is_webapk_)
+        webapk::TrackInstallEvent(webapk::INSTALL_EVENT_BANNER_IGNORED);
+    }
   }
 
   TrackDismissEvent(DISMISS_EVENT_DISMISSED);
@@ -176,12 +194,13 @@ bool AppBannerInfoBarDelegateAndroid::AcceptWebApk(
         base::android::ConvertUTF8ToJavaString(env, webapk_package_name_);
     Java_AppBannerInfoBarDelegateAndroid_openWebApk(env, java_delegate_,
                                                     java_webapk_package_name);
-
+    webapk::TrackUserAction(webapk::USER_ACTION_INSTALLED_OPEN);
     SendBannerAccepted(web_contents, "web");
     return true;
   }
 
   // Request install the WebAPK.
+  install_state_ = webapk::INSTALLING;
   TrackUserResponse(USER_RESPONSE_WEB_APP_ACCEPTED);
   AppBannerSettingsHelper::RecordBannerInstallEvent(
       web_contents, shortcut_info_->url.spec(), AppBannerSettingsHelper::WEB);
@@ -281,6 +300,8 @@ void AppBannerInfoBarDelegateAndroid::InfoBarDismissed() {
     AppBannerSettingsHelper::RecordBannerDismissEvent(
         web_contents, native_app_package_, AppBannerSettingsHelper::NATIVE);
   } else {
+    if (is_webapk_)
+      TrackWebApkInstallationDismissEvents(install_state_);
     TrackUserResponse(USER_RESPONSE_WEB_APP_DISMISSED);
     AppBannerSettingsHelper::RecordBannerDismissEvent(
         web_contents, shortcut_info_->url.spec(), AppBannerSettingsHelper::WEB);
@@ -308,8 +329,10 @@ bool AppBannerInfoBarDelegateAndroid::Accept() {
   if (!native_app_data_.is_null())
     return AcceptNativeApp(web_contents);
 
-  if (is_webapk_)
+  if (is_webapk_) {
+    webapk::TrackStartType(webapk::STARTED_FROM_BANNER);

[dominickn, 2016/09/09 08:14:11]

Won't this metric be hit at least twice when the user installs a WebAPK? Once in
AppBannerInfoBarDelegateAndroid::Create, and again here? The way I understand
it, when the A2HS menu item is selected for a WebAPK, it'll create an infobar
delegate, show the infobar, and wait for the user to hit Add before proceeding
right?

[Xi Han, 2016/09/09 15:37:32]

No, it is only hit here, not by AppBannerInfoBarDelegateAndroid::Create(). When
the A2HS menu item is selected, the banner will skip the waiting step but
directly jumping to the "Adding" step.

     return AcceptWebApk(web_contents);
+  }
 
   return AcceptWebApp(web_contents);
 }
@@ -368,6 +391,7 @@ void AppBannerInfoBarDelegateAndroid::OnWebApkInstallFinished(
       infobar()->RemoveSelf();
     Java_AppBannerInfoBarDelegateAndroid_showWebApkInstallFailureToast(env);
     DVLOG(1) << "The WebAPK installation failed.";
+    webapk::TrackInstallEvent(webapk::INSTALL_EVENT_FAILED);
     return;
   }
 
@@ -379,6 +403,8 @@ void AppBannerInfoBarDelegateAndroid::OnWebApkInstallFinished(
   Java_AppBannerInfoBarDelegateAndroid_setWebApkPackageName(
       env, java_delegate_, java_webapk_package_name);
   UpdateInstallState(env, nullptr);
+  install_state_ = webapk::INSTALLED;
+  webapk::TrackInstallEvent(webapk::INSTALL_EVENT_COMPLETED);
 }
 
 bool AppBannerInfoBarDelegateAndroid::LinkClicked(