Reintroduce plumbing for user gesture into permission system.

blimp/engine/app/blimp_permission_manager.h

Index: blimp/engine/app/blimp_permission_manager.h
diff --git a/blimp/engine/app/blimp_permission_manager.h b/blimp/engine/app/blimp_permission_manager.h
index 7b09262abd9c957c00659bc2fbd2e3bdf1f6c98b..8b016cd197428049c2a73d847d23dd4bea12f0df 100644
--- a/blimp/engine/app/blimp_permission_manager.h
+++ b/blimp/engine/app/blimp_permission_manager.h
@@ -24,12 +24,14 @@ class BlimpPermissionManager : public content::PermissionManager {
       content::PermissionType permission,
       content::RenderFrameHost* render_frame_host,
       const GURL& requesting_origin,
+      bool user_gesture,
       const base::Callback<void(blink::mojom::PermissionStatus)>& callback)
       override;
   int RequestPermissions(
       const std::vector<content::PermissionType>& permission,
       content::RenderFrameHost* render_frame_host,
       const GURL& requesting_origin,
+      bool user_gesture,
       const base::Callback<
           void(const std::vector<blink::mojom::PermissionStatus>&)>& callback)
       override;