[Android] Add spellchecking support in android_webview.

android_webview/renderer/aw_content_renderer_client.h

 // Copyright 2012 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.
 
 #ifndef ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_
 #define ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_
 
 #include <memory>
 #include <string>
 
 #include "android_webview/renderer/aw_render_thread_observer.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "components/web_restrictions/interfaces/web_restrictions.mojom.h"
 #include "content/public/renderer/content_renderer_client.h"
 
+#if defined(ENABLE_SPELLCHECK)
+class SpellCheck;
+class SpellCheckProvider;
+#endif
+
 namespace visitedlink {
 class VisitedLinkSlave;
 }
 
 namespace android_webview {
 
 class AwContentRendererClient : public content::ContentRendererClient {
  public:
   AwContentRendererClient();
   ~AwContentRendererClient() override;
@@ skipping 23 matching lines @@
                         blink::WebNavigationType type,
                         blink::WebNavigationPolicy default_policy,
                         bool is_redirect) override;
   bool ShouldUseMediaPlayerForURL(const GURL& url) override;
 
  private:
   std::unique_ptr<AwRenderThreadObserver> aw_render_thread_observer_;
   std::unique_ptr<visitedlink::VisitedLinkSlave> visited_link_slave_;
   web_restrictions::mojom::WebRestrictionsPtr web_restrictions_service_;
 
+#if defined(ENABLE_SPELLCHECK)
+  std::unique_ptr<SpellCheck> spellcheck_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(AwContentRendererClient);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_