[Experimental] Supporting OOPIF printing

chrome/browser/printing/print_composite_client.h

+// Copyright 2017 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.
+
+#include "base/memory/shared_memory_handle.h"
+#include "base/sequenced_task_runner.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+#include "services/pdf_compositor/public/cpp/pdf_compositor_client.h"
+
+#ifndef CHROME_BROWSER_PRINTING_PRINT_COMPOSITE_CLIENT_H_
+#define CHROME_BROWSER_PRINTING_PRINT_COMPOSITE_CLIENT_H_
+
+namespace printing {
+
+class PrintCompositeClient
+    : public pdf_compositor::PdfCompositorClient,
+      public content::NotificationObserver,
+      public content::WebContentsObserver,
+      public content::WebContentsUserData<PrintCompositeClient> {
+ public:
+  explicit PrintCompositeClient(content::WebContents* web_contents);
+  ~PrintCompositeClient() override;
+
+  void DoComposite(
+      int page_num,
+      base::SharedMemoryHandle handle,
+      uint32_t data_size,
+      const pdf_compositor::mojom::PdfCompositor::CompositePdfCallback&
+          callback,
+      scoped_refptr<base::SequencedTaskRunner> callback_task_runner);
+
+ private:
+  // content::NotificationObserver implementation.
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  void OnIsReadyToComposite(
+      int page_num,
+      base::SharedMemoryHandle handle,
+      uint32_t data_size,
+      const pdf_compositor::mojom::PdfCompositor::CompositePdfCallback&
+          callback,
+      scoped_refptr<base::SequencedTaskRunner> callback_task_runner,
+      bool status);
+
+  content::NotificationRegistrar registrar_;
+
+  base::WeakPtrFactory<PrintCompositeClient> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintCompositeClient);
+};
+
+}  // namespace printing
+
+#endif  // CHROME_BROWSER_PRINTING_PRINT_COMPOSITE_CLIENT_H_