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

content/browser/android/content_view_core_impl.cc

 // 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.
 
 #include "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 1513 matching lines @@
         static_cast<NavigationControllerImpl&>(web_contents_->GetController());
     controller.ReloadOriginalRequestURL(false);
   }
 }
 
 void ContentViewCoreImpl::SetAccessibilityEnabled(JNIEnv* env, jobject obj,
                                                   bool enabled) {
   SetAccessibilityEnabledInternal(enabled);
 }
 
+void ContentViewCoreImpl::ShowSelectionHandlesAutomatically() const {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj(java_ref_.get(env));
+  if (obj.is_null())
+    return;
+  Java_ContentViewCore_showSelectionHandlesAutomatically(env, obj.obj());
+}
+
 void ContentViewCoreImpl::SetAccessibilityEnabledInternal(bool enabled) {
   accessibility_enabled_ = enabled;
   RenderWidgetHostViewAndroid* host_view = GetRenderWidgetHostViewAndroid();
   if (!host_view)
     return;
   RenderWidgetHostImpl* host_impl = RenderWidgetHostImpl::From(
       host_view->GetRenderWidgetHost());
   BrowserAccessibilityState* accessibility_state =
       BrowserAccessibilityState::GetInstance();
   if (enabled) {
@@ skipping 138 matching lines @@
       reinterpret_cast<ui::WindowAndroid*>(window_android),
       retained_objects_set);
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content