Fall back to shortcut A2HS when Phonesky is out of date or unavailable.

chrome/browser/android/webapk/chrome_webapk_host.cc

Index: chrome/browser/android/webapk/chrome_webapk_host.cc
diff --git a/chrome/browser/android/webapk/chrome_webapk_host.cc b/chrome/browser/android/webapk/chrome_webapk_host.cc
index 1ebfe489246fc3076d391f0c714144da27011ca7..ab33479d198b3d3e33b44f1d23b6f9f196288b0b 100644
--- a/chrome/browser/android/webapk/chrome_webapk_host.cc
+++ b/chrome/browser/android/webapk/chrome_webapk_host.cc
@@ -21,9 +21,9 @@ bool ChromeWebApkHost::Register(JNIEnv* env) {
 }
 
 // static
-bool ChromeWebApkHost::AreWebApkEnabled() {
+bool ChromeWebApkHost::CanInstallWebApk() {
   JNIEnv* env = base::android::AttachCurrentThread();
-  return Java_ChromeWebApkHost_areWebApkEnabled(env);
+  return Java_ChromeWebApkHost_isWebApkInstallFlowAvailable(env);
 }
 
 // static
@@ -33,3 +33,12 @@ jboolean CanUseGooglePlayToInstallWebApk(
   return variations::GetVariationParamValueByFeature(
              chrome::android::kImprovedA2HS, kPlayInstall) == "true";
 }
+
+// static
+jboolean CanInstallFromUnknownSources(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& clazz) {
+  return base::FeatureList::GetInstance()->IsFeatureOverriddenFromCommandLine(
+             chrome::android::kImprovedA2HS.name,
+             base::FeatureList::OVERRIDE_ENABLE_FEATURE);
+}