Pass device scale factor from display to ws.

ui/display/fake_display_delegate.cc

Index: ui/display/fake_display_delegate.cc
diff --git a/ui/display/fake_display_delegate.cc b/ui/display/fake_display_delegate.cc
index 8f02397c2c9efb9885ca16622b83e5b12371edca..d88556f2e0fcb8fcdb2f3553d72219bb3e9f750e 100644
--- a/ui/display/fake_display_delegate.cc
+++ b/ui/display/fake_display_delegate.cc
@@ -134,7 +134,20 @@ 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) {}