FrameSinkIds use to WindowIds in window server, Process ID/Route ID in renderer

services/ui/ws/ids.h

 // Copyright 2014 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.
 
 #ifndef SERVICES_UI_WS_IDS_H_
 #define SERVICES_UI_WS_IDS_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 35 matching lines @@
     return other.client_id == client_id && other.window_id == window_id;
   }
 
   bool operator!=(const WindowId& other) const { return !(*this == other); }
 
   bool operator<(const WindowId& other) const {
     return std::tie(client_id, window_id) <
            std::tie(other.client_id, other.window_id);
   }
 
+  operator uint32_t() const {

[sky, 2016/10/04 17:50:53]

Actually, one comment. Style guide says no to implicit conversion:
https://google.github.io/styleguide/cppguide.html#Implicit_Conversions .

[Fady Samuel, 2016/10/04 19:31:57]

Using WindowIdToTransportId instead.

+    return (client_id << 16) | window_id;
+  }
+
   std::string ToString() const {
     return base::StringPrintf("%u:%u", client_id, window_id);
   }
 
   ClientSpecificId client_id;
   ClientSpecificId window_id;
 };
 
 // Used for ids assigned by the client.
 struct ClientWindowId {
@@ skipping 44 matching lines @@
 template <>
 struct hash<ui::ws::WindowId> {
   size_t operator()(const ui::ws::WindowId& id) const {
     return hash<ui::Id>()(WindowIdToTransportId(id));
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 
 #endif  // SERVICES_UI_WS_IDS_H_