Update WebAPK if homescreen icon changed.

chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc

Index: chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc
diff --git a/chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc b/chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc
index cb82d2b7c8fc20197ffeb42be58648b24e7026cb..56e1f11d3cef5bfdad8198caa569c5ff94c752ec 100644
--- a/chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc
+++ b/chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc
@@ -7,7 +7,9 @@
 #include <jni.h>
 
 #include "base/android/jni_string.h"
+#include "chrome/browser/android/shortcut_helper.h"
 #include "chrome/browser/android/shortcut_info.h"
+#include "chrome/browser/manifest/manifest_icon_selector.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/manifest.h"
@@ -111,6 +113,14 @@ void ManifestUpgradeDetectorFetcher::OnDidGetManifest(
   info.UpdateFromManifest(manifest);
   info.manifest_url = manifest_url;
 
+  int ideal_homescreen_icon_size_in_dp =
+      ShortcutHelper::GetIdealHomescreenIconSizeInDp();
+  int minimum_homescreen_icon_size_in_dp =
+      ShortcutHelper::GetMinimumHomescreenIconSizeInDp();
+  info.icon_url = ManifestIconSelector::FindBestMatchingIcon(
+      manifest.icons, ideal_homescreen_icon_size_in_dp,
+      minimum_homescreen_icon_size_in_dp);
+
   OnDataAvailable(info);
 }
 
@@ -125,6 +135,8 @@ void ManifestUpgradeDetectorFetcher::OnDataAvailable(const ShortcutInfo& info) {
       base::android::ConvertUTF16ToJavaString(env, info.name);
   ScopedJavaLocalRef<jstring> java_short_name =
       base::android::ConvertUTF16ToJavaString(env, info.short_name);
+  ScopedJavaLocalRef<jstring> java_icon_url =
+      base::android::ConvertUTF8ToJavaString(env, info.icon_url.spec());
 
   Java_ManifestUpgradeDetectorFetcher_onDataAvailable(
       env, java_ref_.obj(),
@@ -132,6 +144,7 @@ void ManifestUpgradeDetectorFetcher::OnDataAvailable(const ShortcutInfo& info) {
       java_scope.obj(),
       java_name.obj(),
       java_short_name.obj(),
+      java_icon_url.obj(),
       info.display,
       info.orientation,
       info.theme_color,