webapps: initial addition of splash screen icon downloading

chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h

Index: chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
diff --git a/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h b/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
index 448c5c12d680f6ec6225778a26bede369284e47c..06519a15fdd3a522aa889db234869d39311fcca8 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
+++ b/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
@@ -31,7 +31,9 @@ class AddToHomescreenDialogHelper :
  public:
   AddToHomescreenDialogHelper(JNIEnv* env,
                               jobject obj,
-                              content::WebContents* web_contents);
+                              content::WebContents* web_contents,
+                              int ideal_splash_image_size_in_dp,
+                              int ideal_icon_size_in_dp);
 
   // Called by the Java counterpart to destroy its native half.
   void Destroy(JNIEnv* env, jobject obj);