Mac: fix screen capture freezes when context menu popup in Chrome.

webrtc/modules/desktop_capture/screen_capturer_mac.mm

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 80 matching lines @@
   }
 
   void UnregisterActiveStreams() {
     for (auto& pair : display_stream_wrappers_) {
       DisplayStreamWrapper& wrapper = pair.second;
       if (wrapper.active) {
         wrapper.active = false;
         CFRunLoopSourceRef source =
             CGDisplayStreamGetRunLoopSource(wrapper.stream);
         CFRunLoopRemoveSource(CFRunLoopGetCurrent(), source,
-                              kCFRunLoopDefaultMode);
+                              kCFRunLoopCommonModes);
         CGDisplayStreamStop(wrapper.stream);
       }
     }
   }
 
   void PrepareForSelfDestruction() {
     ready_for_self_destruction_ = true;
 
     if (display_stream_wrappers_.empty())
       delete this;
@@ skipping 853 matching lines @@
     CGDisplayStreamRef display_stream = CGDisplayStreamCreate(
         display_id, pixel_width, pixel_height, 'BGRA', nullptr, handler);
 
     if (display_stream) {
       CGError error = CGDisplayStreamStart(display_stream);
       if (error != kCGErrorSuccess)
         return false;
 
       CFRunLoopSourceRef source =
           CGDisplayStreamGetRunLoopSource(display_stream);
-      CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode);
+      CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);
       display_stream_manager_->SaveStream(unique_id, display_stream);
     }
   }
 
   return true;
 }
 
 void ScreenCapturerMac::UnregisterRefreshAndMoveHandlers() {
   display_stream_manager_->UnregisterActiveStreams();
 }
@@ skipping 34 matching lines @@
   std::unique_ptr<ScreenCapturerMac> capturer(
       new ScreenCapturerMac(options.configuration_monitor()));
   if (!capturer.get()->Init()) {
     return nullptr;
   }
 
   return capturer;
 }
 
 }  // namespace webrtc