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 ede552f9d3181d968df5d56f350308e86604fbf8..be1ce90578161d891fe25d57c3a5e642ba15522d 100644
--- a/ui/touch_selection/BUILD.gn
+++ b/ui/touch_selection/BUILD.gn
@@ -16,9 +16,13 @@ component("touch_selection") {
     "selection_event_type.h",
     "touch_handle.cc",
     "touch_handle.h",
+    "touch_handle_drawable_aura.cc",
+    "touch_handle_drawable_aura.h",
     "touch_handle_orientation.h",
     "touch_selection_controller.cc",
     "touch_selection_controller.h",
+    "touch_selection_menu_runner.cc",
+    "touch_selection_menu_runner.h",
     "ui_touch_selection_export.h",
   ]
 
@@ -26,11 +30,31 @@ component("touch_selection") {
 
   deps = [
     "//base:base",
+    "//ui/aura:aura",
+    "//ui/aura_extra:aura_extra",
     "//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/aura_extra:aura_extra",
+      "//ui/compositor:compositor",
+      "//ui/gfx:gfx",
+    ]
+
+    sources -= [
+      "touch_handle_drawable_aura.cc",
+      "touch_handle_drawable_aura.h",
+      "touch_selection_menu_runner.cc",
+      "touch_selection_menu_runner.h",
+    ]
+  }
 }
 
 test("ui_touch_selection_unittests") {