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

ui/touch_selection/BUILD.gn

Index: ui/touch_selection/BUILD.gn
diff --git a/ui/touch_selection/BUILD.gn b/ui/touch_selection/BUILD.gn
index e6767cb4f91459b722e65ee1eed841caf34195b0..a019d1dbb9c2cb29f6905f28009bc0f4d7067657 100644
--- a/ui/touch_selection/BUILD.gn
+++ b/ui/touch_selection/BUILD.gn
@@ -16,8 +16,14 @@ component("touch_selection") {
     "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",
   ]
 
@@ -25,28 +31,54 @@ component("touch_selection") {
 
   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) {