[TTS] Add an ACK message to SelectWordAroundCaret.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 02d54e80dd4ee6e0859437b3074fea776cf05db5..798f731a86e80107ef7f0ab871dfc8bf3bb360de 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -484,6 +484,8 @@ bool RenderWidgetHostViewAndroid::OnMessageReceived(
     IPC_MESSAGE_HANDLER(ViewHostMsg_StartContentIntent, OnStartContentIntent)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ShowUnhandledTapUIIfNeeded,
                         OnShowUnhandledTapUIIfNeeded)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_SelectWordAroundCaret_ACK,
+                        OnSelectWordAroundCaretAck)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -638,6 +640,15 @@ void RenderWidgetHostViewAndroid::OnShowUnhandledTapUIIfNeeded(int x_dip,
   content_view_core_->OnShowUnhandledTapUIIfNeeded(x_dip, y_dip);
 }
 
+void RenderWidgetHostViewAndroid::OnSelectWordAroundCaretAck(bool did_select,
+                                                             int start_adjust,
+                                                             int end_adjust) {
+  if (!content_view_core_)
+    return;
+  content_view_core_->OnSelectWordAroundCaretAck(did_select, start_adjust,
+                                                 end_adjust);
+}
+
 gfx::Rect RenderWidgetHostViewAndroid::GetViewBounds() const {
   if (!content_view_core_)
     return default_bounds_;