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content / common / main_frame_counter.h [blame]
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_COMMON_MAIN_FRAME_COUNTER_H_
#define CONTENT_COMMON_MAIN_FRAME_COUNTER_H_
#include <stddef.h>
#include "base/component_export.h"
namespace content {
// This should only be used from the Renderer process, but is placed in common
// so the Browser process can access it for testing only.
//
// This keeps track of how many main frames exist in the current Renderer
// process.
//
// This is for an ongoing experiment to reduce memory usage in Renderers that
// only contain subframes; it should be removed if the experiment does not
// end up shipping. See: crbug.com/1331368 for tracking.
class COMPONENT_EXPORT(MAIN_FRAME_COUNTER) MainFrameCounter final {
public:
static bool has_main_frame();
private:
friend class RenderFrameImpl;
static void IncrementCount();
static void DecrementCount();
static size_t main_frame_count_;
};
} // namespace content
#endif // CONTENT_COMMON_MAIN_FRAME_COUNTER_H_