Reland: Move TouchSelectionController from content to ui

BUILD.gn

 # Copyright (c) 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 115 matching lines @@
     "//ui/display",
     "//ui/events",
     "//ui/gfx",
     "//ui/gl",
     "//ui/keyboard",
     "//ui/native_theme",
     "//ui/resources",
     "//ui/snapshot",
     "//ui/strings",
     "//ui/surface",
+    "//ui/touch_selection",
     "//ui/views",
     "//ui/views/controls/webview",
     "//ui/web_dialogs",
     "//url",
     "//v8:v8",
   ]
   deps += root_extra_deps
 
   if (!is_win) {
     deps += [ "//breakpad:symupload" ]
@@ skipping 144 matching lines @@
       "//third_party/usrsctp",
       "//ui/app_list",
       "//ui/aura",
       "//ui/keyboard",
       "//ui/views",
       "//ui/views/controls/webview",
       "//ui/web_dialogs",
     ]
   }
 
+  if (is_mac || is_ios) {
+    deps -= [
+      "//ui/touch_selection",
+    ]
+  }
+
   if (is_win) {
     deps -= [
       "//apps",
       "//ash",
       "//chrome/browser",
       "//chrome/browser/devtools",
       "//chrome/common",
       "//chrome/plugin",
       "//chrome/renderer",
       "//chrome/test",
@@ skipping 37 matching lines @@
       "//ui/aura",
       "//ui/base",
       "//ui/display",
       "//ui/events",
       "//ui/gfx",
       "//ui/gl",
       "//ui/keyboard",
       "//ui/native_theme",
       "//ui/snapshot",
       "//ui/surface",
+      "//ui/touch_selection",
       "//ui/views",
       "//ui/views/controls/webview",
       "//ui/web_dialogs",
       "//ui/wm",
     ]
   }
 }