webapps: initial addition of splash screen icon downloading

chrome/browser/android/banners/app_banner_manager_android.h

Index: chrome/browser/android/banners/app_banner_manager_android.h
diff --git a/chrome/browser/android/banners/app_banner_manager_android.h b/chrome/browser/android/banners/app_banner_manager_android.h
index 0beea17a63aea754bd0ce90af47dab87dde27e87..1e9c7924c284539cadc091d482453274c64c8684 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.h
+++ b/chrome/browser/android/banners/app_banner_manager_android.h
@@ -25,7 +25,10 @@ class AppBannerManagerAndroid : public AppBannerManager {
   // Registers native methods.
   static bool Register(JNIEnv* env);
 
-  AppBannerManagerAndroid(JNIEnv* env, jobject obj, int icon_size);
+  AppBannerManagerAndroid(JNIEnv* env,
+                          jobject obj,
+                          int splash_icon_size,
+                          int icon_size);
   ~AppBannerManagerAndroid() override;
 
   // Destroys the AppBannerManagerAndroid.
@@ -66,6 +69,9 @@ class AppBannerManagerAndroid : public AppBannerManager {
   std::string ExtractQueryValueForName(const GURL& url,
                                        const std::string& name);
 
+  // Ideal splashscreen icon size to use.
+  const int ideal_splash_icon_size_;
+
   // AppBannerManager on the Java side.
   JavaObjectWeakGlobalRef weak_java_banner_view_manager_;