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

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 795 matching lines @@
     MULTI_VALUE_TYPE(kEnableGpuRasterizationChoices)
   },
   {
     "gpu-rasterization-msaa-sample-count",
     IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_NAME,
     IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_DESCRIPTION,
     kOsAll,
     MULTI_VALUE_TYPE(kGpuRasterizationMSAASampleCountChoices)
   },
   {
+    "disable-slimming-paint",
+    IDS_FLAGS_DISABLE_SLIMMING_PAINT_NAME,
+    IDS_FLAGS_DISABLE_SLIMMING_PAINT_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(switches::kDisableSlimmingPaint)
+  },
+  {
     "enable-slimming-paint",
     IDS_FLAGS_ENABLE_SLIMMING_PAINT_NAME,
     IDS_FLAGS_ENABLE_SLIMMING_PAINT_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableSlimmingPaint)
   },
   {
     "enable-experimental-web-platform-features",
     IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_NAME,
     IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_DESCRIPTION,
@@ skipping 2202 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags