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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_WEBUI_TOP_CHROME_WEBUI_CONTENTS_WARMUP_LEVEL_H_
#define CHROME_BROWSER_UI_WEBUI_TOP_CHROME_WEBUI_CONTENTS_WARMUP_LEVEL_H_
#include <string>
// The readiness levels of the browser prior to showing a new WebUI bubble,
// ordered by increasing readiness. Higher levels have lower latency at the cost
// of greater memory use.
enum class WebUIContentsWarmupLevel {
// No render process is available. No pre-existing process, including spare
// renderers, can be used or reused for this WebUI.
kNoRenderer,
// Uses a spare render process for this WebUI.
kSpareRenderer,
// Uses a render process that already hosts other WebUIs prior to this WebUI.
kDedicatedRenderer,
// Uses a WebContents that is preloaded with a different WebUI and therefore
// requires redirection to this WebUI.
// TODO(325836830): WebContents forbids navigation between WebUIs. This
// is mostly due to the asynchronous update of RenderFrameHost that causes
// difficulty in WebUIImpl lifetime management.
kRedirectedWebContents,
// Uses a WebContents that is preloaded with this WebUI but is never shown.
// TODO(325928324): investigate why this is slower than re-showing contents.
kPreloadedWebContents,
// Re-showing a WebContents that has already navigated to this WebUI.
kReshowingWebContents,
};
std::string ToString(WebUIContentsWarmupLevel warmup_level);
#endif // CHROME_BROWSER_UI_WEBUI_TOP_CHROME_WEBUI_CONTENTS_WARMUP_LEVEL_H_
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