diff --git chrome/browser/permissions/chrome_permissions_client.cc chrome/browser/permissions/chrome_permissions_client.cc
index 894a7424580ac..fa78c8dabbdd2 100644
--- chrome/browser/permissions/chrome_permissions_client.cc
+++ chrome/browser/permissions/chrome_permissions_client.cc
@@ -12,6 +12,7 @@
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
 #include "build/chromeos_buildflags.h"
+#include "cef/libcef/features/runtime.h"
 #include "chrome/browser/bluetooth/bluetooth_chooser_context_factory.h"
 #include "chrome/browser/content_settings/cookie_settings_factory.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
@@ -212,6 +213,9 @@ permissions::PermissionManager* ChromePermissionsClient::GetPermissionManager(
 double ChromePermissionsClient::GetSiteEngagementScore(
     content::BrowserContext* browser_context,
     const GURL& origin) {
+  // No SiteEngagementService with the Alloy runtime.
+  if (cef::IsAlloyRuntimeEnabled())
+    return 0.0;
   return site_engagement::SiteEngagementService::Get(
              Profile::FromBrowserContext(browser_context))
       ->GetScore(origin);
diff --git chrome/browser/ui/permission_bubble/permission_prompt.h chrome/browser/ui/permission_bubble/permission_prompt.h
index c2836d15eba30..0c03c2b4666a6 100644
--- chrome/browser/ui/permission_bubble/permission_prompt.h
+++ chrome/browser/ui/permission_bubble/permission_prompt.h
@@ -11,6 +11,13 @@ namespace content {
 class WebContents;
 }
 
+using CreatePermissionPromptFunctionPtr =
+    std::unique_ptr<permissions::PermissionPrompt> (*)(
+        content::WebContents* web_contents,
+        permissions::PermissionPrompt::Delegate* delegate,
+        bool* default_handling);
+void SetCreatePermissionPromptFunction(CreatePermissionPromptFunctionPtr);
+
 // Factory function to create permission prompts for chrome.
 std::unique_ptr<permissions::PermissionPrompt> CreatePermissionPrompt(
     content::WebContents* web_contents,
diff --git chrome/browser/ui/views/permission_bubble/permission_prompt_impl.cc chrome/browser/ui/views/permission_bubble/permission_prompt_impl.cc
index 70e37336a5001..a2df1bd28c994 100644
--- chrome/browser/ui/views/permission_bubble/permission_prompt_impl.cc
+++ chrome/browser/ui/views/permission_bubble/permission_prompt_impl.cc
@@ -100,11 +100,28 @@ bool ShouldBubbleStartOpen(permissions::PermissionPrompt::Delegate* delegate) {
   return false;
 }
 
+CreatePermissionPromptFunctionPtr g_create_permission_prompt_ptr = nullptr;
+
 }  // namespace
 
+void SetCreatePermissionPromptFunction(
+    CreatePermissionPromptFunctionPtr ptr) {
+  g_create_permission_prompt_ptr = ptr;
+}
+
 std::unique_ptr<permissions::PermissionPrompt> CreatePermissionPrompt(
     content::WebContents* web_contents,
     permissions::PermissionPrompt::Delegate* delegate) {
+  if (g_create_permission_prompt_ptr) {
+    bool default_handling = true;
+    auto prompt = g_create_permission_prompt_ptr(web_contents, delegate,
+                                                 &default_handling);
+    if (prompt)
+      return prompt;
+    if (!default_handling)
+      return nullptr;
+  }
+
   Browser* browser = chrome::FindBrowserWithWebContents(web_contents);
   if (!browser) {
     DLOG(WARNING) << "Permission prompt suppressed because the WebContents is "