linux: Pass subpixel positioning setting to WebKit.

content/common/view_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 278 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(password_form)
   IPC_STRUCT_TRAITS_MEMBER(contents_mime_type)
   IPC_STRUCT_TRAITS_MEMBER(socket_address)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::RendererPreferences)
   IPC_STRUCT_TRAITS_MEMBER(can_accept_load_drops)
   IPC_STRUCT_TRAITS_MEMBER(should_antialias_text)
   IPC_STRUCT_TRAITS_MEMBER(hinting)
   IPC_STRUCT_TRAITS_MEMBER(subpixel_rendering)
+  IPC_STRUCT_TRAITS_MEMBER(use_subpixel_positioning)
   IPC_STRUCT_TRAITS_MEMBER(focus_ring_color)
   IPC_STRUCT_TRAITS_MEMBER(thumb_active_color)
   IPC_STRUCT_TRAITS_MEMBER(thumb_inactive_color)
   IPC_STRUCT_TRAITS_MEMBER(track_color)
   IPC_STRUCT_TRAITS_MEMBER(active_selection_bg_color)
   IPC_STRUCT_TRAITS_MEMBER(active_selection_fg_color)
   IPC_STRUCT_TRAITS_MEMBER(inactive_selection_bg_color)
   IPC_STRUCT_TRAITS_MEMBER(inactive_selection_fg_color)
   IPC_STRUCT_TRAITS_MEMBER(browser_handles_non_local_top_level_requests)
   IPC_STRUCT_TRAITS_MEMBER(browser_handles_all_top_level_requests)
@@ skipping 1781 matching lines @@
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)
 
 // Screen was rotated. Dispatched to the onorientationchange javascript API.
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)