Accelerator Key's are not visible for Left and right Rotation in pdf context menu.

chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.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/ui/views/renderer_context_menu/render_view_context_menu_views.h"
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 72 matching lines @@
 
     case IDC_CONTENT_CONTEXT_PASTE_AND_MATCH_STYLE:
       *accel = ui::Accelerator(ui::VKEY_V,
                                ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN);
       return true;
 
     case IDC_CONTENT_CONTEXT_SELECTALL:
       *accel = ui::Accelerator(ui::VKEY_A, ui::EF_CONTROL_DOWN);
       return true;
 
+    case IDC_CONTENT_CONTEXT_ROTATECCW:
+      *accel = ui::Accelerator(ui::VKEY_OEM_4, ui::EF_CONTROL_DOWN);
+      return true;
+
+    case IDC_CONTENT_CONTEXT_ROTATECW:
+      *accel = ui::Accelerator(ui::VKEY_OEM_6, ui::EF_CONTROL_DOWN);
+      return true;
+
     default:
       return false;
   }
 }
 
 void RenderViewContextMenuViews::ExecuteCommand(int command_id,
                                                 int event_flags) {
   switch (command_id) {
     case IDC_WRITING_DIRECTION_DEFAULT:
       // WebKit's current behavior is for this menu item to always be disabled.
@@ skipping 106 matching lines @@
       WebContents::FromRenderFrameHost(GetRenderFrameHost());
   if (!web_contents) {
     LOG(ERROR) << "RenderViewContextMenuViews::Show, couldn't find WebContents";
     return NULL;
   }
   return web_contents->GetFullscreenRenderWidgetHostView()
              ? web_contents->GetFullscreenRenderWidgetHostView()
                    ->GetNativeView()
              : web_contents->GetNativeView();
 }