[WIP] Make content_shell run under Wayland

ui/display/screen.h

Index: ui/display/screen.h
diff --git a/ui/display/screen.h b/ui/display/screen.h
index 79a0035d2565e9aa4b27d5723591ecd4397f403b..bb1b3443beb6162fbc103c1fdb67b0d5550a1b1b 100644
--- a/ui/display/screen.h
+++ b/ui/display/screen.h
@@ -88,6 +88,13 @@ class DISPLAY_EXPORT Screen {
   virtual gfx::Rect DIPToScreenRectInWindow(gfx::NativeView view,
                                             const gfx::Rect& dip_rect) const;
 
+  // Called when the compositor geometry has been changed.
+  virtual void OnOutputGeometryChanged(int32_t name, const gfx::Rect& rect) { }
+
+  // In case of ozone wayland, we need to wait for information of the compositor
+  // geometry.
+  virtual void WaitForScreenSizeAvailable() { }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(Screen);
 };