content/common/render_frame_metadata.mojom

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module content.mojom;

import "ui/gfx/geometry/mojo/geometry.mojom";

// See components/viz/service/quads/render_frame_metadata.h
struct RenderFrameMetadata {
  gfx.mojom.Vector2dF root_scroll_offset;
};

// This interface is provided by the renderer. It can optionally enable
// notifications for all frame submissions.
interface RenderFrameMetadataObserver {
  // When |enabled| is set to true, this will notify the associated client of
  // all frame submissions.
  ReportAllFrameSubmissionsForTesting(bool enabled);
};

// This interface is provided by the browser. It is notified of all changes to
// RenderFrameMetadata. It can be notified of all frame submissions, via
// RenderFrameMetadataObserver::ReportAllFrameSubmissionsForTesting.
interface RenderFrameMetadataObserverClient {
  // Notified when RenderFrameMetadata has changed.
  OnRenderFrameMetadataChanged(RenderFrameMetadata metadata);

  // Notified on all frame submissions.
  OnFrameSubmissionForTesting();
};