Reintroduce plumbing for user gesture into permission system.

content/test/mock_permission_manager.h

Index: content/test/mock_permission_manager.h
diff --git a/content/test/mock_permission_manager.h b/content/test/mock_permission_manager.h
index d9151b9d96577d1c012ef573eb1f32f4adbc83f2..3f767aeb285cd3d3c9120034ed71369f53c5a90e 100644
--- a/content/test/mock_permission_manager.h
+++ b/content/test/mock_permission_manager.h
@@ -31,12 +31,14 @@ class MockPermissionManager : public PermissionManager {
       PermissionType permission,
       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<PermissionType>& permission,
       RenderFrameHost* render_frame_host,
       const GURL& requesting_origin,
+      bool user_gesture,
       const base::Callback<
           void(const std::vector<blink::mojom::PermissionStatus>&)>& callback)
       override;