SetBounds even when size didn't change.

ui/aura/root_window_host_linux.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/root_window_host_linux.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xcursor/Xcursor.h>
 #include <X11/Xlib.h>
 #include <X11/cursorfont.h>
@@ skipping 802 matching lines @@
 
 void RootWindowHostLinux::SetBounds(const gfx::Rect& bounds) {
   // Even if the host window's size doesn't change, aura's root window
   // size, which is in DIP, changes when the scale changes.
   float current_scale = root_window_->compositor()->device_scale_factor();
   float new_scale =
       gfx::Screen::GetDisplayNearestWindow(root_window_).device_scale_factor();
   bool size_changed = bounds_.size() != bounds.size() ||
       current_scale != new_scale;
 
-  if (!size_changed) {
-    root_window_->SchedulePaintInRect(root_window_->bounds());
-    return;
-  }
-
   if (bounds.size() != bounds_.size())
     XResizeWindow(xdisplay_, xwindow_, bounds.width(), bounds.height());
 
   if (bounds.origin() != bounds_.origin())
     XMoveWindow(xdisplay_, xwindow_, bounds.x(), bounds.y());
 
   // Assume that the resize will go through as requested, which should be the
   // case if we're running without a window manager.  If there's a window
   // manager, it can modify or ignore the request, but (per ICCCM) we'll get a
   // (possibly synthetic) ConfigureNotify about the actual size and correct
   // |bounds_| later.
   bounds_ = bounds;
   if (size_changed)
     root_window_->OnHostResized(bounds.size());
+  else
+    root_window_->SchedulePaintInRect(root_window_->bounds());
 }
 
 gfx::Point RootWindowHostLinux::GetLocationOnNativeScreen() const {
   return bounds_.origin();
 }
 
 void RootWindowHostLinux::SetCapture() {
   // TODO(oshima): Grab x input.
 }
 
@@ skipping 211 matching lines @@
       ui::ViewProp::GetValue(accelerated_widget, kRootWindowHostLinuxKey));
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   ::Display* xdisplay = base::MessagePumpAuraX11::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura