Support InputMethodManager#updateCursorAnchorInfo for Android 5.0 (C++ version)

ui/base/BUILD.gn

Index: ui/base/BUILD.gn
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index fb1402b2a1b3333d0df8f62636183b3ef59aaba4..a9ed5452524547a2bab6adb5e03e1735a23b652a 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -317,7 +317,16 @@ component("base") {
   ]
 
   if (build_ime) {
+    if (is_android) {
+      deps += [ "//cc" ]
+    }
+
     sources += [
+      "ime/android/cursor_anchor_info_builder.cc",
+      "ime/android/cursor_anchor_info_builder.h",
+      "ime/android/cursor_anchor_info_controller.cc",
+      "ime/android/cursor_anchor_info_controller.h",
+      "ime/android/cursor_anchor_info_sender.h",
       "ime/candidate_window.cc",
       "ime/candidate_window.h",
       "ime/chromeos/character_composer.cc",
@@ -737,6 +746,7 @@ if (is_android) {
   generate_jni("ui_base_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/base/Clipboard.java",
+      "../android/java/src/org/chromium/ui/base/CursorAnchorInfoBuilder.java",
       "../android/java/src/org/chromium/ui/base/DeviceFormFactor.java",
       "../android/java/src/org/chromium/ui/base/LocalizationUtils.java",
       "../android/java/src/org/chromium/ui/base/ResourceBundle.java",
@@ -806,6 +816,7 @@ test("ui_base_unittests") {
 
   if (build_ime) {
     sources += [
+      "ime/android/cursor_anchor_info_controller_unittest.cc",
       "ime/candidate_window_unittest.cc",
       "ime/chromeos/character_composer_unittest.cc",
       "ime/input_method_base_unittest.cc",