Rewrite clipboard write IPC handling to be easier to understand.

content/renderer/scoped_clipboard_writer_glue.cc

-// Copyright (c) 2013 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 "content/renderer/scoped_clipboard_writer_glue.h"
-#include "base/logging.h"
-
-namespace content {
-
-ScopedClipboardWriterGlue::ScopedClipboardWriterGlue(ClipboardClient* client)
-    : ui::ScopedClipboardWriter(ui::CLIPBOARD_TYPE_COPY_PASTE),
-      context_(client->CreateWriteContext()) {
-  DCHECK(context_);
-}
-
-ScopedClipboardWriterGlue::~ScopedClipboardWriterGlue() {
-  if (!objects_.empty() && context_) {
-    context_->Flush(objects_);
-    // TODO(dcheng): Temporary hack while the clipboard IPCs are cleaned up.
-    // This prevents the base class destructor from also trying to (probably
-    // unsuccessfully) flush things to the clipboard.
-    objects_.clear();
-  }
-}
-
-void ScopedClipboardWriterGlue::WriteBitmapFromPixels(const void* pixels,
-                                                      const gfx::Size& size) {
-  if (context_) {
-    context_->WriteBitmapFromPixels(&objects_, pixels, size);
-  } else {
-    NOTREACHED();
-  }
-}
-
-}  // namespace content
-