Pass WebAPK install source to AppBannerInfobarDelegateAndroid constructor.

chrome/browser/android/banners/app_banner_infobar_delegate_android.h

Index: chrome/browser/android/banners/app_banner_infobar_delegate_android.h
diff --git a/chrome/browser/android/banners/app_banner_infobar_delegate_android.h b/chrome/browser/android/banners/app_banner_infobar_delegate_android.h
index ee90ad6479dc71ec9881b27e593ac61ff9819e82..92d5bdd0aeb2ffd3dca134ff6ca9b3c4fa6f7454 100644
--- a/chrome/browser/android/banners/app_banner_infobar_delegate_android.h
+++ b/chrome/browser/android/banners/app_banner_infobar_delegate_android.h
@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
+#include "chrome/browser/android/webapk/webapk_metrics.h"
 #include "chrome/browser/banners/app_banner_manager.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "ui/gfx/image/image.h"
@@ -40,7 +41,7 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
       std::unique_ptr<SkBitmap> icon,
       int event_request_id,
       bool is_webapk,
-      bool start_install_webapk);
+      webapk::InstallSource webapk_install_source);
 
   // Creates and shows the infobar for an Android app.
   // Creates an infobar and delegate for promoting the installation of an
@@ -71,12 +72,8 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
                          const base::android::JavaParamRef<jobject>& obj,
                          jboolean success);
 
-  // When user accepts to install a WebAPK, this function sends a request
-  // to the WebAPK Server to create a WebAPK and install it. It returns
-  // false to prevent infobar from disappearing when installation starts.
-  // When user clicks the Open button after the intallation is compelete, this
-  // function launches the installed WebAPK and returns true.
-  bool AcceptWebApk(content::WebContents* web_contents);
+  // ConfirmInfoBarDelegate:

[dominickn, 2016/09/27 01:36:55]

Does this method need to be public? If it's only being called from
AppBannerInfoBarDelegate::Create, then you should be able to keep it private
where it was originally.

[Xi Han, 2016/09/27 13:44:04]

Well, it has to be public. The AppBannerInfoBarDelegateAndroid::Create() is a
static function, so it can only call public function of the
AppBannerInfoBarDelegateAndroid. 

+  bool Accept() override;
 
  private:
   // The states of a WebAPK installation, where the infobar is displayed during
@@ -95,7 +92,8 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
       std::unique_ptr<ShortcutInfo> info,
       std::unique_ptr<SkBitmap> icon,
       int event_request_id,
-      bool is_webapk);
+      bool is_webapk,
+      webapk::InstallSource webapk_install_source);
 
   // Delegate for promoting an Android app.
   AppBannerInfoBarDelegateAndroid(
@@ -109,6 +107,14 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
   void CreateJavaDelegate();
   bool AcceptNativeApp(content::WebContents* web_contents);
   bool AcceptWebApp(content::WebContents* web_contents);
+
+  // When user accepts to install a WebAPK, this function sends a request
+  // to the WebAPK Server to create a WebAPK and install it. It returns
+  // false to prevent infobar from disappearing when installation starts.
+  // When user clicks the Open button after the intallation is compelete, this
+  // function launches the installed WebAPK and returns true.
+  bool AcceptWebApk(content::WebContents* web_contents);
+
   void SendBannerAccepted(content::WebContents* web_contents,
                           const std::string& platform);
   void OnWebApkInstallFinished(bool success, const std::string& webapk_package);
@@ -120,7 +126,6 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
   void InfoBarDismissed() override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
-  bool Accept() override;
   bool LinkClicked(WindowOpenDisposition disposition) override;
 
   base::android::ScopedJavaGlobalRef<jobject> java_delegate_;
@@ -146,6 +151,10 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
   // Indicates the current state of a WebAPK installation.
   InstallState install_state_;
 
+  // Indicates the way in which a WebAPK (if applicable) is installed: from the
+  // menu or from an app banner.
+  webapk::InstallSource webapk_install_source_;
+
   base::WeakPtrFactory<AppBannerInfoBarDelegateAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerInfoBarDelegateAndroid);