Use Web Manifest when creating a shortcut on Chrome Android.

chrome/browser/android/shortcut_helper.h

Index: chrome/browser/android/shortcut_helper.h
diff --git a/chrome/browser/android/shortcut_helper.h b/chrome/browser/android/shortcut_helper.h
index 04ef1bad004e0b3d030e89c002be712968d6205a..3a4fb6bf397fb23501f8946b3de8616d6b1a167c 100644
--- a/chrome/browser/android/shortcut_helper.h
+++ b/chrome/browser/android/shortcut_helper.h
@@ -16,6 +16,7 @@
 
 namespace content {
 class WebContents;
+struct Manifest;
 }  // namespace content
 
 namespace IPC {
@@ -47,6 +48,9 @@ class ShortcutHelper : public content::WebContentsObserver {
   // IPC message received when the initialization is finished.
   void OnDidGetWebApplicationInfo(const WebApplicationInfo& web_app_info);
 
+  // Callback run when the Manifest is ready to be used.
+  void OnDidGetManifest(const content::Manifest& manifest);
+
   // Adds a shortcut to the current URL to the Android home screen.
   void AddShortcut(JNIEnv* env,
                    jobject obj,
@@ -84,6 +88,8 @@ class ShortcutHelper : public content::WebContentsObserver {
   favicon_base::FaviconRawBitmapResult icon_;
   base::CancelableTaskTracker cancelable_task_tracker_;
 
+  base::WeakPtrFactory<ShortcutHelper> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ShortcutHelper);
 };