[TTS] Add an ACK message to SelectWordAroundCaret.

content/renderer/render_view_impl.cc

 // Copyright (c) 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/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 1255 matching lines @@
     // platform specific ones at the end.
 
     // Have the super handle all other messages.
     IPC_MESSAGE_UNHANDLED(handled = RenderWidget::OnMessageReceived(message))
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
 void RenderViewImpl::OnSelectWordAroundCaret() {
-  if (!webview())
-    return;
+  // Set default values for the ACK
+  bool did_select = false;
+  int start_adjust = 0;
+  int end_adjust = 0;
 
-  input_handler_->set_handling_input_event(true);
-  webview()->FocusedFrame()->SelectWordAroundCaret();
-  input_handler_->set_handling_input_event(false);
+  if (webview()) {
+    WebLocalFrame* focused_frame = GetWebView()->FocusedFrame();
+    if (focused_frame) {
+      input_handler_->set_handling_input_event(true);
+      blink::WebRange initial_range = focused_frame->SelectionRange();
+      did_select = focused_frame->SelectWordAroundCaret();
+      if (did_select) {
+        blink::WebRange adjusted_range = focused_frame->SelectionRange();
+        start_adjust =
+            adjusted_range.StartOffset() - initial_range.StartOffset();
+        end_adjust = adjusted_range.EndOffset() - initial_range.EndOffset();
+      }
+      input_handler_->set_handling_input_event(false);
+    }
+  }
+  Send(new ViewHostMsg_SelectWordAroundCaretAck(GetRoutingID(), did_select,
+                                                start_adjust, end_adjust));
 }
 
 void RenderViewImpl::OnUpdateTargetURLAck() {
   // Check if there is a targeturl waiting to be sent.
   if (target_url_status_ == TARGET_PENDING)
     Send(new ViewHostMsg_UpdateTargetURL(GetRoutingID(), pending_target_url_));
 
   target_url_status_ = TARGET_NONE;
 }
 
@@ skipping 1366 matching lines @@
                         input_event.GetCoalescedEventsPointers(), latency_info,
                         dispatch_type);
     return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
   }
   idle_user_detector_->ActivityDetected();
   return RenderWidget::HandleInputEvent(input_event, latency_info,
                                         dispatch_type);
 }
 
 }  // namespace content