[Android] Select text when stylus first button is pressed.

ui/events/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")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom4/keycode_converter.cc",
     "keycodes/dom4/keycode_converter.h",
@@ skipping 217 matching lines @@
 }
 
 source_set("events_test_support") {
   sources = [
     "test/cocoa_test_event_utils.h",
     "test/cocoa_test_event_utils.mm",
     "test/events_test_utils.cc",
     "test/events_test_utils.h",
     "test/events_test_utils_x11.cc",
     "test/events_test_utils_x11.h",
+    "test/mock_motion_event.cc",
+    "test/mock_motion_event.h",
     "test/platform_event_waiter.cc",
     "test/platform_event_waiter.h",
     "test/test_event_handler.cc",
     "test/test_event_handler.h",
     "test/test_event_processor.cc",
     "test/test_event_processor.h",
     "test/test_event_target.cc",
     "test/test_event_target.h",
   ]
 
@@ skipping 23 matching lines @@
 test("events_unittests") {
   sources = [
     "cocoa/events_mac_unittest.mm",
     "event_dispatcher_unittest.cc",
     "event_processor_unittest.cc",
     "event_rewriter_unittest.cc",
     "event_unittest.cc",
     "gestures/velocity_calculator_unittest.cc",
     "gesture_detection/bitset_32_unittest.cc",
     "gesture_detection/gesture_provider_unittest.cc",
-    "gesture_detection/mock_motion_event.h",
-    "gesture_detection/mock_motion_event.cc",
     "gesture_detection/velocity_tracker_unittest.cc",
     "gesture_detection/touch_disposition_gesture_filter_unittest.cc",
     "keycodes/dom4/keycode_converter_unittest.cc",
     "latency_info_unittest.cc",
     "platform/platform_event_source_unittest.cc",
     "x/events_x_unittest.cc",
   ]
 
   if (!use_x11) {
     sources -= [
@@ skipping 13 matching lines @@
     ":events_base",
     ":events_test_support",
     ":gesture_detection",
     "//base",
     "//base/test:run_all_unittests",
     "//skia",
     "//testing/gtest",
     "//ui/gfx:gfx_test_support",
   ]
 }