Rewrite clipboard write IPC handling to be easier to understand.

content/browser/renderer_host/clipboard_message_filter.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_CLIPBOARD_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_CLIPBOARD_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/memory/shared_memory.h"
 #include "content/common/clipboard_format.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "ui/base/clipboard/clipboard.h"
 
 class GURL;
 
+namespace ui {
+class ScopedClipboardWriter;
+}  // namespace ui
+
 namespace content {
 
-class ClipboardMessageFilter : public BrowserMessageFilter {
+class ClipboardMessageFilterTest;
+
+class CONTENT_EXPORT ClipboardMessageFilter : public BrowserMessageFilter {
  public:
   ClipboardMessageFilter();
 
   void OverrideThreadForMessage(const IPC::Message& message,
                                 BrowserThread::ID* thread) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
+  friend class ClipboardMessageFilterTest;
+
   ~ClipboardMessageFilter() override;
 
-  void OnWriteObjectsAsync(const ui::Clipboard::ObjectMap& objects);
-  void OnWriteObjectsSync(const ui::Clipboard::ObjectMap& objects,
-                          base::SharedMemoryHandle bitmap_handle);
-  static void WriteObjectsOnUIThread(const ui::Clipboard::ObjectMap* objects);
-
   void OnGetSequenceNumber(const ui::ClipboardType type,
                            uint64* sequence_number);
   void OnIsFormatAvailable(ClipboardFormat format,
                            ui::ClipboardType type,
                            bool* result);
   void OnClear(ui::ClipboardType type);
   void OnReadAvailableTypes(ui::ClipboardType type,
                             std::vector<base::string16>* types,
                             bool* contains_filenames);
   void OnReadText(ui::ClipboardType type, base::string16* result);
   void OnReadHTML(ui::ClipboardType type,
                   base::string16* markup,
                   GURL* url,
                   uint32* fragment_start,
                   uint32* fragment_end);
   void OnReadRTF(ui::ClipboardType type, std::string* result);
   void OnReadImage(ui::ClipboardType type, IPC::Message* reply_msg);
   void OnReadImageReply(const SkBitmap& bitmap, IPC::Message* reply_msg);
   void OnReadCustomData(ui::ClipboardType clipboard_type,
                         const base::string16& type,
                         base::string16* result);
   void OnReadData(const ui::Clipboard::FormatType& format,
                   std::string* data);
 
+  void OnWriteText(ui::ClipboardType clipboard_type,
+                   const base::string16& text);
+  void OnWriteHTML(ui::ClipboardType clipboard_type,
+                   const base::string16& markup,
+                   const GURL& url);
+  void OnWriteSmartPasteMarker(ui::ClipboardType clipboard_type);
+  void OnWriteCustomData(ui::ClipboardType clipboard_type,
+                         const std::map<base::string16, base::string16>& data);
+  void OnWriteBookmark(ui::ClipboardType clipboard_type,
+                       const GURL& url,
+                       const base::string16& title);
+  void OnWriteImage(ui::ClipboardType clipboard_type,
+                    const gfx::Size& size,
+                    base::SharedMemoryHandle handle);
+  void OnCommitWrite(ui::ClipboardType clipboard_type);
+
 #if defined(OS_MACOSX)
   void OnFindPboardWriteString(const base::string16& text);
 #endif
 
   // We have our own clipboard because we want to access the clipboard on the
   // IO thread instead of forwarding (possibly synchronous) messages to the UI
   // thread. This instance of the clipboard should be accessed only on the IO
   // thread.
   static ui::Clipboard* GetClipboard();
 
+  scoped_ptr<ui::ScopedClipboardWriter> clipboard_writer_;
+
   DISALLOW_COPY_AND_ASSIGN(ClipboardMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_CLIPBOARD_MESSAGE_FILTER_H_