mac: Add support for asynchronous dictionary lookup

content/browser/renderer_host/text_input_client_mac.mm

 // 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.
 
 #import "content/browser/renderer_host/text_input_client_mac.h"
 
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
@@ skipping 15 matching lines @@
 }
 
 TextInputClientMac::~TextInputClientMac() {
 }
 
 // static
 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();
 
   BeforeRequest();
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
   rwhi->Send(new TextInputClientMsg_CharacterIndexForPoint(rwhi->GetRoutingID(),
                                                           point));
   // http://crbug.com/121917
   base::ThreadRestrictions::ScopedAllowWait allow_wait;
@@ skipping 85 matching lines @@
   character_index_ = NSNotFound;
   first_rect_ = NSZeroRect;
   substring_.reset();
 }
 
 void TextInputClientMac::AfterRequest() {
   lock_.Release();
 }
 
 }  // namespace content