Move clipboard-related webkit_glue embedder functions into a ClipboardClient interface.

webkit/glue/scoped_clipboard_writer_glue.cc

+// Copyright (c) 2011 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 "webkit/glue/scoped_clipboard_writer_glue.h"
+
+ScopedClipboardWriterGlue::ScopedClipboardWriterGlue(
+    webkit_glue::ClipboardClient* client)
+    : ui::ScopedClipboardWriter(client->GetClipboard()),
+      context_(client->CreateWriteContext()) {
+}
+
+ScopedClipboardWriterGlue::~ScopedClipboardWriterGlue() {
+  if (context_)
+    context_->FlushAndDestroy(objects_);
+}
+
+void ScopedClipboardWriterGlue::WriteBitmapFromPixels(const void* pixels,
+                                                      const gfx::Size& size) {
+  if (context_) {
+    context_->WriteBitmapFromPixels(&objects_, pixels, size);
+  } else {
+    ScopedClipboardWriter::WriteBitmapFromPixels(pixels, size);
+  }
+}