Add new flag to automatically install isolated apps during chrome startup.

Design Doc: go/isolated-app-origin-auto-install

Bug: 1333966
Change-Id: Ifc2227b2af79f23c6ada1ea2b04b05b7b5bbdda8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3661764
Commit-Queue: Nicolas Ouellet-Payeur <[email protected]>
Auto-Submit: Dmitrii Kuragin <[email protected]>
Reviewed-by: Robbie McElrath <[email protected]>
Reviewed-by: Nicolas Ouellet-Payeur <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1011493}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 0623f4b..3dec5bca 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -1584,6 +1584,12 @@
 const char kInProductHelpUseClientConfigDescription[] =
     "Enable In-Product Help to use client side configuration.";
 
+const char kInstallIssolatedAppsAtStartup[] =
+    "Install Isolated Apps at Startup";
+const char kInstallIssolatedAppsAtStartupDescription[] =
+    "Isolated application URLs that Chrome should install during startup, "
+    "specified as a comma-separated list";
+
 const char kInstalledAppsInCbdName[] = "Installed Apps in Clear Browsing Data";
 const char kInstalledAppsInCbdDescription[] =
     "Adds the installed apps warning dialog to the clear browsing data flow "