Reintroduce plumbing for user gesture into permission system.

chromecast/browser/cast_permission_manager.cc

Index: chromecast/browser/cast_permission_manager.cc
diff --git a/chromecast/browser/cast_permission_manager.cc b/chromecast/browser/cast_permission_manager.cc
index 47f953cd1a037593af99be6e5d811ebbd6d84865..a126718ee3616bc354380bfaa37a05d7d4297919 100644
--- a/chromecast/browser/cast_permission_manager.cc
+++ b/chromecast/browser/cast_permission_manager.cc
@@ -22,6 +22,7 @@ int CastPermissionManager::RequestPermission(
     content::PermissionType permission,
     content::RenderFrameHost* render_frame_host,
     const GURL& origin,
+    bool user_gesture,
     const base::Callback<void(blink::mojom::PermissionStatus)>& callback) {
   LOG(INFO) << __FUNCTION__ << ": " << static_cast<int>(permission);
   callback.Run(blink::mojom::PermissionStatus::GRANTED);
@@ -32,6 +33,7 @@ int CastPermissionManager::RequestPermissions(
     const std::vector<content::PermissionType>& permissions,
     content::RenderFrameHost* render_frame_host,
     const GURL& requesting_origin,
+    bool user_gesture,
     const base::Callback<
         void(const std::vector<blink::mojom::PermissionStatus>&)>& callback) {
   callback.Run(std::vector<blink::mojom::PermissionStatus>(