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

content/child/runtime_features.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 "content/child/runtime_features.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 189 matching lines @@
 
   if (command_line.HasSwitch(switches::kEnableWebVR)) {
     WebRuntimeFeatures::enableWebVR(true);
     WebRuntimeFeatures::enableFeatureFromString(
         std::string("GeometryInterfaces"), true);
   }
 
   if (command_line.HasSwitch(switches::kDisablePresentationAPI))
     WebRuntimeFeatures::enablePresentationAPI(false);
 
+  if (command_line.HasSwitch(switches::kEnablePointerEvents)) {
+      WebRuntimeFeatures::enableFeatureFromString(

[Rick Byers, 2016/01/08 19:38:24]

nit: Might as well add a enablePointerEvent method to avoid going via a (more
error-prone) string.  Looks trivial to do.  Most of the RuntimeEnabledFeatures
machinery is auto-generated from RuntimeEnabledFeatures.in but apparently not
this little piece of glue :-(

+        std::string("PointerEvent"), true);
+  }
+
   // Enable explicitly enabled features, and then disable explicitly disabled
   // ones.
   if (command_line.HasSwitch(switches::kEnableBlinkFeatures)) {
     std::vector<std::string> enabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kEnableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : enabled_features)
       WebRuntimeFeatures::enableFeatureFromString(feature, true);
   }
   if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
     std::vector<std::string> disabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : disabled_features)
       WebRuntimeFeatures::enableFeatureFromString(feature, false);
   }
 }
 
 }  // namespace content