Reintroduce plumbing for user gesture into permission system.

content/test/mock_permission_manager.cc

Index: content/test/mock_permission_manager.cc
diff --git a/content/test/mock_permission_manager.cc b/content/test/mock_permission_manager.cc
index 09fb9358b6c6b75358e100f4bfbb3252ab5cb423..f7864d0e603f9ae6599d330103ac27bfa671acae 100644
--- a/content/test/mock_permission_manager.cc
+++ b/content/test/mock_permission_manager.cc
@@ -16,6 +16,7 @@ int MockPermissionManager::RequestPermission(
     PermissionType permission,
     RenderFrameHost* render_frame_host,
     const GURL& requesting_origin,
+    bool user_gesture,
     const base::Callback<void(blink::mojom::PermissionStatus)>& callback) {
   return kNoPendingOperation;
 }
@@ -24,6 +25,7 @@ int MockPermissionManager::RequestPermissions(
     const std::vector<PermissionType>& permission,
     RenderFrameHost* render_frame_host,
     const GURL& requesting_origin,
+    bool user_gesture,
     const base::Callback<
         void(const std::vector<blink::mojom::PermissionStatus>&)>& callback) {
   return kNoPendingOperation;