[SP] Enable Slimming Paint by default in Chromium and Blink.

chrome/browser/chromeos/login/chrome_restart_request.cc

 // Copyright 2013 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 "chrome/browser/chromeos/login/chrome_restart_request.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "base/command_line.h"
@@ skipping 73 matching lines @@
     ::switches::kDisableGpuRasterization,
     ::switches::kDisableImplSidePainting,
     ::switches::kDisableLowResTiling,
     ::switches::kDisableMediaSource,
     ::switches::kDisableOneCopy,
     ::switches::kDisablePreferCompositingToLCDText,
     ::switches::kDisablePrefixedEncryptedMedia,
     ::switches::kDisablePanelFitting,
     ::switches::kDisableSeccompFilterSandbox,
     ::switches::kDisableSetuidSandbox,
+    ::switches::kDisableSlimmingPaint,
     ::switches::kDisableSurfaces,
     ::switches::kDisableTextBlobs,
     ::switches::kDisableThreadedScrolling,
     ::switches::kDisableTouchDragDrop,
     ::switches::kDisableTouchEditing,
     ::switches::kEnableBlinkFeatures,
     ::switches::kEnableCompositorAnimationTimelines,
     ::switches::kEnableDelegatedRenderer,
     ::switches::kDisableDisplayList2dCanvas,
     ::switches::kEnableDisplayList2dCanvas,
@@ skipping 273 matching lines @@
     // Relaunch chrome without session manager on dev box.
     ReLaunch(command_line);
     return;
   }
 
   // ChromeRestartRequest deletes itself after request sent to session manager.
   (new ChromeRestartRequest(command_line))->Start();
 }
 
 }  // namespace chromeos