ash: Clean up system background layer.

ui/views/widget/desktop_root_window_host_win.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/views/widget/desktop_root_window_host_win.h"
 
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/desktop/desktop_activation_client.h"
@@ skipping 384 matching lines @@
 
 void DesktopRootWindowHostWin::UnConfineCursor() {
 }
 
 void DesktopRootWindowHostWin::MoveCursorTo(const gfx::Point& location) {
 }
 
 void DesktopRootWindowHostWin::SetFocusWhenShown(bool focus_when_shown) {
 }
 
+bool DesktopRootWindowHostLinux::CopyAreaToSkCanvas(
+    const gfx::Rect& source_bounds,
+    const gfx::Point& dest_offset,
+    SkCanvas* canvas) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 bool DesktopRootWindowHostWin::GrabSnapshot(
       const gfx::Rect& snapshot_bounds,
       std::vector<unsigned char>* png_representation) {
+  NOTIMPLEMENTED();
   return false;
 }
 
 void DesktopRootWindowHostWin::PostNativeEvent(
     const base::NativeEvent& native_event) {
 }
 
 void DesktopRootWindowHostWin::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
 }
@@ skipping 321 matching lines @@
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura,
     const gfx::Rect& initial_bounds) {
   return new DesktopRootWindowHostWin(native_widget_delegate,
                                       desktop_native_widget_aura,
                                       initial_bounds);
 }
 
 }  // namespace views