[TTS] Add an ACK message to SelectWordAroundCaret.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 83640d7a96da178d57ffdfc0ce6824a0f7d3fdc7..afb3b3f04f7b5dfec2df4a1dc3084da8974bddbc 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1273,12 +1273,28 @@ bool RenderViewImpl::OnMessageReceived(const IPC::Message& message) {
 }
 
 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() {