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

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index c592d723351906721d1d2c734a065ef56047e288..340aba161ab810f999891cf06db99d25c8fc66af 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -1531,6 +1531,14 @@ void ContentViewCoreImpl::SetAccessibilityEnabled(JNIEnv* env, jobject obj,
   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();