Move SelectionBound from ui/base/touch to ui/gfx to be used by cc

ui/gfx/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/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 137 matching lines @@
     "platform_font_mac.mm",
     "platform_font_win.cc",
     "platform_font_win.h",
     "scoped_cg_context_save_gstate_mac.h",
     "scoped_ns_graphics_context_save_gstate_mac.h",
     "scoped_ns_graphics_context_save_gstate_mac.mm",
     "scoped_ui_graphics_push_context_ios.h",
     "scoped_ui_graphics_push_context_ios.mm",
     "scrollbar_size.cc",
     "scrollbar_size.h",
+    "selection_bound.cc",
+    "selection_bound.h",
     "selection_model.cc",
     "selection_model.h",
     "sequential_id_generator.cc",
     "sequential_id_generator.h",
     "shadow_value.cc",
     "shadow_value.h",
     "skbitmap_operations.cc",
     "skbitmap_operations.h",
     "skia_util.cc",
     "skia_util.h",
@@ skipping 561 matching lines @@
       "image/image_mac_unittest.mm",
       "image/image_util_unittest.cc",
       "mac/coordinate_conversion_unittest.mm",
       "mojo/struct_traits_unittest.cc",
       "nine_image_painter_unittest.cc",
       "path_mac_unittest.mm",
       "platform_font_mac_unittest.mm",
       "range/range_mac_unittest.mm",
       "range/range_unittest.cc",
       "range/range_win_unittest.cc",
+      "selection_bound_unittest.cc",
       "sequential_id_generator_unittest.cc",
       "shadow_value_unittest.cc",
       "skbitmap_operations_unittest.cc",
       "skrect_conversion_unittest.cc",
       "transform_util_unittest.cc",
       "utf16_indexing_unittest.cc",
     ]
   }
 
   if (!is_android && !is_ios) {
@@ skipping 77 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }