[Android] Add spellchecking support in android_webview.

android_webview/BUILD.gn

Index: android_webview/BUILD.gn
diff --git a/android_webview/BUILD.gn b/android_webview/BUILD.gn
index ab7b4845b381714f250d6f7e6250ecdf6da6b30a..cff6eec821733be5ea0e15c2d36bead8c7c50a12 100644
--- a/android_webview/BUILD.gn
+++ b/android_webview/BUILD.gn
@@ -591,6 +591,8 @@ source_set("common") {
     "//components/printing/browser",
     "//components/printing/common",
     "//components/printing/renderer",
+    "//components/spellcheck/browser",
+    "//components/spellcheck/renderer",
     "//components/supervised_user_error_page",
     "//components/supervised_user_error_page:gin",
     "//components/version_info",
@@ -704,6 +706,7 @@ android_library("android_webview_java") {
     "//base:base_java",
     "//components/external_video_surface:java",
     "//components/navigation_interception/android:navigation_interception_java",
+    "//components/spellcheck/browser/android:java",
     "//components/web_contents_delegate_android:web_contents_delegate_android_java",
     "//components/web_restrictions:web_restrictions_java",
     "//content/public/android:content_java",