mac: Add support for asynchronous dictionary lookup

content/browser/renderer_host/text_input_client_mac.mm

Index: content/browser/renderer_host/text_input_client_mac.mm
diff --git a/content/browser/renderer_host/text_input_client_mac.mm b/content/browser/renderer_host/text_input_client_mac.mm
index b9d900a704ea47ca047bce8d9220ab57c744eaf7..6bccccf07d0227c2b999ccbac011ee47cae847be 100644
--- a/content/browser/renderer_host/text_input_client_mac.mm
+++ b/content/browser/renderer_host/text_input_client_mac.mm
@@ -33,6 +33,23 @@ TextInputClientMac* TextInputClientMac::GetInstance() {
   return Singleton<TextInputClientMac>::get();
 }
 
+void TextInputClientMac::GetStringAtPoint(
+    RenderWidgetHost* rwh,
+    gfx::Point point,
+    void (^replyHandler)(NSAttributedString*, NSPoint)) {
+  replyHandler_.reset(replyHandler, base::scoped_policy::RETAIN);

[Avi (use Gerrit), 2014/03/12 04:55:40]

Out of paranoia, DCHECK if the replyHandler_ isn't NULL before this point.

[Andre, 2014/03/12 16:59:26]

Done.

+  RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
+  rwhi->Send(new TextInputClientMsg_StringAtPoint(rwhi->GetRoutingID(), point));
+}
+
+void TextInputClientMac::GetStringAtPointReply(NSAttributedString* string,
+                                               NSPoint point) {

[Avi (use Gerrit), 2014/03/12 04:55:40]

Isn't this guaranteed to be on the main thread?

[Andre, 2014/03/12 16:59:26]

No, this happens on the IO thread.

+  if (replyHandler_.get()) {
+    replyHandler_.get()(string, point);
+    replyHandler_.reset();
+  }
+}
+
 NSUInteger TextInputClientMac::GetCharacterIndexAtPoint(RenderWidgetHost* rwh,
     gfx::Point point) {
   base::TimeTicks start = base::TimeTicks::Now();