Enable hidpi on Linux, refactor a bit on Windows to share

ui/aura/remote_window_tree_host_win.cc

 // 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.
 
 #include "ui/aura/remote_window_tree_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_property.h"
 #include "ui/base/cursor/cursor_loader_win.h"
 #include "ui/base/ime/composition_text.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/remote_input_method_win.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/base/view_prop.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_code_conversion_win.h"
+#include "ui/gfx/dpi.h"
 #include "ui/gfx/insets.h"
-#include "ui/gfx/win/dpi.h"
 #include "ui/metro_viewer/metro_viewer_messages.h"
 
 namespace aura {
 
 namespace {
 
 const char* kWindowTreeHostWinKey = "__AURA_REMOTE_WINDOW_TREE_HOST_WIN__";
 
 // Sets the keystate for the virtual key passed in to down or up.
 void SetKeyState(uint8* key_states, bool key_down, uint32 virtual_key_code) {
@@ skipping 477 matching lines @@
 }
 
 void RemoteWindowTreeHostWin::SetEventFlags(uint32 flags) {
   if (flags == event_flags_)
     return;
   event_flags_ = flags;
   SetVirtualKeyStates(event_flags_);
 }
 
 }  // namespace aura