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

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 655ced680dc7ceec741b31a85e396883cb850de8..85a2ea00288d126b02a1a8a5e35fbf544b26dc70 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -207,6 +207,11 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   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)) {