disable crtcs bigger than new screen size during mode switch

ui/display/chromeos/x11/native_display_delegate_x11.h

 // Copyright 2014 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.
 
 #ifndef UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_DELEGATE_X11_H_
 #define UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_DELEGATE_X11_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 93 matching lines @@
   // Helper method for GetOutputs() that returns an OutputSnapshot struct based
   // on the passed-in information.
   DisplaySnapshotX11* InitDisplaySnapshot(RROutput id,
                                           XRROutputInfo* info,
                                           RRCrtc* last_used_crtc,
                                           int index);
 
   // Destroys unused CRTCs and parks used CRTCs in a way which allows a
   // framebuffer resize. This is faster than turning them off, resizing,
   // then turning them back on.
-  void DestroyUnusedCrtcs();
+  void DestroyUnusedCrtcs(const gfx::Size& new_size);
 
   bool ConfigureCrtc(RRCrtc crtc, RRMode mode, RROutput output, int x, int y);
 
   // Returns whether |id| is configured to preserve aspect when scaling.
   bool IsOutputAspectPreservingScaling(RROutput id);
 
   // Creates the gamma ramp for |new_profile|, or NULL if it doesn't exist.
   // The caller should take the ownership.
   XRRCrtcGamma* CreateGammaRampForProfile(
       const DisplaySnapshotX11& x11_output,
@@ skipping 28 matching lines @@
 
   // A background color used during boot time + multi displays.
   uint32_t background_color_argb_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeDisplayDelegateX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_DELEGATE_X11_H_