Added code to disable 'paste' if nothing is present in clipboard to paste.

chrome/browser/renderer_context_menu/render_view_context_menu.cc

 // Copyright 2014 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 "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 1346 matching lines @@
     case IDC_CONTENT_CONTEXT_REDO:
       return !!(params_.edit_flags & WebContextMenuData::CanRedo);
 
     case IDC_CONTENT_CONTEXT_CUT:
       return !!(params_.edit_flags & WebContextMenuData::CanCut);
 
     case IDC_CONTENT_CONTEXT_COPY:
       return !!(params_.edit_flags & WebContextMenuData::CanCopy);
 
     case IDC_CONTENT_CONTEXT_PASTE:
-    case IDC_CONTENT_CONTEXT_PASTE_AND_MATCH_STYLE:
-      return !!(params_.edit_flags & WebContextMenuData::CanPaste);
-
+    case IDC_CONTENT_CONTEXT_PASTE_AND_MATCH_STYLE: {
+      // Disabled if clipboard has no data.
+      std::vector<base::string16> types;
+      bool ignore;
+      ui::Clipboard::GetForCurrentThread()->ReadAvailableTypes(
+          ui::CLIPBOARD_TYPE_COPY_PASTE, &types, &ignore);
+      return types.size() > 0;

[groby-ooo-7-16, 2014/08/05 17:58:55]

nit: !types.empty(), please

+    }
     case IDC_CONTENT_CONTEXT_DELETE:
       return !!(params_.edit_flags & WebContextMenuData::CanDelete);
 
     case IDC_CONTENT_CONTEXT_SELECTALL:
       return !!(params_.edit_flags & WebContextMenuData::CanSelectAll);
 
     case IDC_CONTENT_CONTEXT_OPENLINKOFFTHERECORD:
       return !browser_context_->IsOffTheRecord() &&
              params_.link_url.is_valid() &&
              incognito_avail != IncognitoModePrefs::DISABLED;
@@ skipping 655 matching lines @@
   source_web_contents_->GetRenderViewHost()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }
 
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }