fix: enable navigator.setAppBadge/clearAppBadge (#27067)

shell/browser/badging/badge_manager.h

@@ -0,0 +1,90 @@
+// 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.
+
+#ifndef SHELL_BROWSER_BADGING_BADGE_MANAGER_H_
+#define SHELL_BROWSER_BADGING_BADGE_MANAGER_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/optional.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "mojo/public/cpp/bindings/receiver_set.h"
+#include "third_party/blink/public/mojom/badging/badging.mojom.h"
+#include "url/gurl.h"
+
+namespace content {
+class RenderFrameHost;
+class RenderProcessHost;
+}  // namespace content
+
+namespace badging {
+
+// The maximum value of badge contents before saturation occurs.
+constexpr int kMaxBadgeContent = 99;
+
+// Maintains a record of badge contents and dispatches badge changes to a
+// delegate.
+class BadgeManager : public KeyedService, public blink::mojom::BadgeService {
+ public:
+  BadgeManager();
+  ~BadgeManager() override;
+
+  static void BindFrameReceiver(
+      content::RenderFrameHost* frame,
+      mojo::PendingReceiver<blink::mojom::BadgeService> receiver);
+
+  // Determines the text to put on the badge based on some badge_content.
+  static std::string GetBadgeString(base::Optional<int> badge_content);
+
+ private:
+  // The BindingContext of a mojo request. Allows mojo calls to be tied back
+  // to the execution context they belong to without trusting the renderer for
+  // that information.  This is an abstract base class that different types of
+  // execution contexts derive.
+  class BindingContext {
+   public:
+    virtual ~BindingContext() = default;
+  };
+
+  // The BindingContext for Window execution contexts.
+  class FrameBindingContext final : public BindingContext {
+   public:
+    FrameBindingContext(int process_id, int frame_id)
+        : process_id_(process_id), frame_id_(frame_id) {}
+    ~FrameBindingContext() override = default;
+
+    int GetProcessId() { return process_id_; }
+    int GetFrameId() { return frame_id_; }
+
+   private:
+    int process_id_;
+    int frame_id_;
+  };
+
+  // blink::mojom::BadgeService:
+  // Note: These are private to stop them being called outside of mojo as they
+  // require a mojo binding context.
+  void SetBadge(blink::mojom::BadgeValuePtr value) override;
+  void ClearBadge() override;
+
+  // All the mojo receivers for the BadgeManager. Keeps track of the
+  // render_frame the binding is associated with, so as to not have to rely
+  // on the renderer passing it in.
+  mojo::ReceiverSet<blink::mojom::BadgeService, std::unique_ptr<BindingContext>>
+      receivers_;
+
+  // Delegate which handles actual setting and clearing of the badge.
+  // Note: This is currently only set on Windows and MacOS.
+  // std::unique_ptr<BadgeManagerDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(BadgeManager);
+};
+
+}  // namespace badging
+
+#endif  // SHELL_BROWSER_BADGING_BADGE_MANAGER_H_