Pass device scale factor from display to ws.

ui/display/fake_display_delegate.cc

 // Copyright 2016 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/display/fake_display_delegate.h"
 
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 116 matching lines @@
   callback.Run(displays);
 }
 
 void FakeDisplayDelegate::AddMode(const ui::DisplaySnapshot& output,
                                   const ui::DisplayMode* mode) {}
 
 void FakeDisplayDelegate::Configure(const ui::DisplaySnapshot& output,
                                     const ui::DisplayMode* mode,
                                     const gfx::Point& origin,
                                     const ui::ConfigureCallback& callback) {
-  callback.Run(true);
+  DVLOG(1) << "Configure display id=" << output.display_id()
+           << " with mode=" << (mode ? mode->ToString() : "nullptr")
+           << " and origin=" << origin.ToString();
+
+  for (auto& display : displays_) {
+    if (display->display_id() == output.display_id()) {
+      display->set_current_mode(mode);
+      display->set_origin(origin);
+      callback.Run(true);
+      return;
+    }
+  }
+
+  callback.Run(false);
 }
 
 void FakeDisplayDelegate::CreateFrameBuffer(const gfx::Size& size) {}
 
 void FakeDisplayDelegate::GetHDCPState(
     const ui::DisplaySnapshot& output,
     const ui::GetHDCPStateCallback& callback) {
   callback.Run(false, ui::HDCP_STATE_UNDESIRED);
 }
 
@@ skipping 93 matching lines @@
 
 void FakeDisplayDelegate::OnConfigurationChanged() {
   if (!initialized_)
     return;
 
   FOR_EACH_OBSERVER(ui::NativeDisplayObserver, observers_,
                     OnConfigurationChanged());
 }
 
 }  // namespace display