Touch event flag should control only DOM event firing.

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 117 matching lines @@
 using flags_ui::kOsCrOSOwnerOnly;
 
 namespace about_flags {
 
 namespace {
 
 const unsigned kOsAll = kOsMac | kOsWin | kOsLinux | kOsCrOS | kOsAndroid;
 const unsigned kOsDesktop = kOsMac | kOsWin | kOsLinux | kOsCrOS;
 
 const FeatureEntry::Choice kTouchEventsChoices[] = {
-  { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, "", "" },
-  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
-    switches::kTouchEvents,
-    switches::kTouchEventsEnabled },
-  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
-    switches::kTouchEvents,
-    switches::kTouchEventsDisabled }
+    { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, "", "" },

[Rick Byers, 2016/11/24 23:53:06]

Does this mean that "enabled" is now the default, instead of "auto" (determined
based on the presence of a touchscreen)?  That's going to be a problem for web
compat due to http://crbug.com/392584.  Basically there are still a bunch of
websites on which mouse support is broken when the TouchEvents API is present. 
So IMHO we need to retain this hacky "auto" behavior as the default for the
touch event API status.

The rest of the patch looks great though - thanks especially for the renames /
clarifications!

+    { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kTouchEvents,
+        switches::kTouchEventsDisabled },
+    { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, switches::kTouchEvents,
+        switches::kTouchEventsAuto }
 };
 
 #if defined(USE_AURA)
 const FeatureEntry::Choice kOverscrollHistoryNavigationChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, "", "" },
   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
     switches::kOverscrollHistoryNavigation,
     "0" },
   { IDS_OVERSCROLL_HISTORY_NAVIGATION_SIMPLE_UI,
     switches::kOverscrollHistoryNavigation,
@@ skipping 2163 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags