Add enable flag for pointer events in about://flags

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 2102 matching lines @@
      kOsAndroid,
      SINGLE_VALUE_TYPE_AND_VALUE(
          switches::kMarketUrlForTesting,
          "https://play.google.com/store/apps/details?id=com.android.chrome")},
 #endif  // OS_ANDROID
 #if defined(OS_WIN) || defined(OS_MACOSX)
     {"automatic-tab-discarding", IDS_FLAGS_AUTOMATIC_TAB_DISCARDING_NAME,
      IDS_FLAGS_AUTOMATIC_TAB_DISCARDING_DESCRIPTION, kOsWin | kOsMac,
      FEATURE_VALUE_TYPE(features::kAutomaticTabDiscarding)},
 #endif  // OS_WIN || OS_MACOSX
+    {"enable-pointer-events",  // FLAGS:RECORD_UMA
+      IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_NAME,
+      IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_DESCRIPTION,
+      kOsAll,
+      SINGLE_VALUE_TYPE(switches::kEnablePointerEvents)},
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 193 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags