Reland: Implement Aura side of unified touch text selection for contents

ui/touch_selection/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 component("touch_selection") {
   output_name = "ui_touch_selection"
 
   sources = [
     "selection_event_type.h",
     "touch_handle.cc",
     "touch_handle.h",
+    "touch_handle_drawable_aura.cc",
+    "touch_handle_drawable_aura.h",
     "touch_selection_controller.cc",
     "touch_selection_controller.h",
+    "touch_selection_controller_aura.cc",
+    "touch_selection_controller_aura.h",
+    "touch_selection_menu_runner.cc",
+    "touch_selection_menu_runner.h",
     "ui_touch_selection_export.h",
   ]
 
   defines = [ "UI_TOUCH_SELECTION_IMPLEMENTATION" ]
 
   deps = [
     "//base:base",
+    "//ui/aura:aura",
     "//ui/base:base",
+    "//ui/compositor:compositor",
     "//ui/events:events",
     "//ui/events:gesture_detection",
+    "//ui/gfx:gfx",
     "//ui/gfx/geometry:geometry",
   ]
+
+  if (!use_aura) {
+    deps -= [
+      "//ui/aura:aura",
+      "//ui/compositor:compositor",
+      "//ui/gfx:gfx",
+    ]
+    sources -= [
+      "touch_handle_drawable_aura.cc",
+      "touch_handle_drawable_aura.h",
+      "touch_selection_controller_aura.cc",
+      "touch_selection_controller_aura.h",
+      "touch_selection_menu_runner.cc",
+      "touch_selection_menu_runner.h",
+    ]
+  }
 }
 
 test("ui_touch_selection_unittests") {
   sources = [
+    "run_all_unittests.cc",
     "touch_handle_unittest.cc",
+    "touch_selection_controller_aura_unittest.cc",
     "touch_selection_controller_unittest.cc",
   ]
 
   deps = [
     ":touch_selection",
-    "//base/test:run_all_unittests",
     "//testing/gtest:gtest",
+    "//ui/aura:test_support",
     "//ui/base:base",
     "//ui/events:test_support",
     "//ui/gfx:gfx",
     "//ui/gfx:test_support",
   ]
+
+  if (!use_aura) {
+    deps -= [ "//ui/aura:test_support" ]
+    sources -= [ "touch_selection_controller_aura_unittest.cc" ]
+  }
 }
 
 if (is_android) {
   java_cpp_enum("ui_touch_selection_enums_srcjar") {
     sources = [
       "selection_event_type.h",
     ]
     outputs = [
       "org/chromium/ui/touch_selection/SelectionEventType.java",
     ]
   }
 }