content: Split web_drag_dest_gtk.cc into chrome/ and content/ parts.

chrome/browser/tab_contents/web_drag_dest_delegate_gtk.h

Index: chrome/browser/tab_contents/web_drag_dest_delegate_gtk.h
diff --git a/chrome/browser/tab_contents/web_drag_dest_delegate_gtk.h b/chrome/browser/tab_contents/web_drag_dest_delegate_gtk.h
new file mode 100644
index 0000000000000000000000000000000000000000..d6c540ea2030bc038f8ecc3f704048f49d393e05
--- /dev/null
+++ b/chrome/browser/tab_contents/web_drag_dest_delegate_gtk.h
@@ -0,0 +1,44 @@
+// 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.
+
+#ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_DELEGATE_GTK_H_
+#define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_DELEGATE_GTK_H_
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "base/string16.h"
+
+class GURL;
+class TabContents;
+
+// An optional delegate that listens for drags of bookmark data.
+class WebDragDestDelegateGtk {
+ public:
+  // Announces that a drag has started. It's valid that a drag starts, along
+  // with over/enter/leave/drop notifications without receiving any bookmark
+  // data.
+  virtual void DragInitialize(TabContents* contents) = 0;
+
+  // Returns the bookmark atom type. GTK and Views return different values here.
+  virtual GdkAtom GetBookmarkTargetAtom() const = 0;
+
+  // Called when WebDragDestkGtk detects that there's bookmark data in a
+  // drag. Not every drag will trigger these.
+  virtual void OnReceiveDataFromGtk(GtkSelectionData* data) = 0;
+  virtual void OnReceiveProcessedData(const GURL& url,
+                                      const string16& title) = 0;
+
+  // Notifications of drag progression.
+  virtual void OnDragOver() = 0;
+  virtual void OnDragEnter() = 0;
+  virtual void OnDrop() = 0;
+
+  // This should also clear any state kept about this drag.
+  virtual void OnDragLeave() = 0;
+
+  virtual ~WebDragDestDelegateGtk();
+};
+
+#endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_DELEGATE_GTK_H_