Trigger app banner when add to homescreen is pressed and WebAPKs are enabled.

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 c78aa8def8af41f30db46695348dfc8db65437ab..801e24be44dacc908e78e404f740d53b5acbddfc 100644
--- a/chrome/browser/android/banners/app_banner_infobar_delegate_android.h
+++ b/chrome/browser/android/banners/app_banner_infobar_delegate_android.h
@@ -11,7 +11,6 @@
 #include "base/strings/string16.h"
 #include "chrome/browser/banners/app_banner_manager.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
-#include "content/public/common/manifest.h"
 #include "ui/gfx/image/image.h"
 #include "url/gurl.h"
 
@@ -24,6 +23,7 @@ class InfoBarManager;
 }
 
 class AppBannerInfoBar;
+struct ShortcutInfo;
 
 namespace banners {
 
@@ -35,7 +35,7 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
       base::WeakPtr<AppBannerManager> weak_manager,
       const base::string16& app_title,
       const GURL& manifest_url,
-      const content::Manifest& manifest,
+      std::unique_ptr<ShortcutInfo> info,
       const GURL& icon_url,
       std::unique_ptr<SkBitmap> icon,
       int event_request_id,
@@ -67,6 +67,12 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
                          const base::android::JavaParamRef<jobject>& obj,
                          jboolean success);
 
+  // Called when user clicks the "Add To Homescreen" from the app menu to
+  // install a WebAPK. This function sets the text on infobar to "Adding" and
+  // disables the button to avoid user interaction. It also starts the WebAPK's
+  // installation process automatically.
+  void InstallWebApk(content::WebContents* web_contents);
+
  private:
   void CreateJavaDelegate();
   bool AcceptNativeApp(content::WebContents* web_contents);
@@ -84,6 +90,7 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
   int GetButtons() const override;
   bool Accept() override;
   bool LinkClicked(WindowOpenDisposition disposition) override;
+  AppBannerInfoBarDelegateAndroid* AsAppBannerInfoBarDelegateAndroid() override;
 
   base::android::ScopedJavaGlobalRef<jobject> java_delegate_;
 
@@ -92,7 +99,7 @@ class AppBannerInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
 
   base::string16 app_title_;
   GURL manifest_url_;

[dominickn, 2016/09/06 01:49:23]

Nit: manifest_url and icon_url aren't needed in the object anymore - they were
only used to create ShortcutInfo. Delete them in the constructor and in the
object.

[Xi Han, 2016/09/06 17:20:07]

Done.

-  content::Manifest manifest_;
+  std::unique_ptr<ShortcutInfo> shortcut_info_;
 
   base::android::ScopedJavaGlobalRef<jobject> native_app_data_;