Implement Chrome Extension TabCapture API.

chrome/browser/extensions/extension_tab_id_map.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_tab_id_map.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/tab_contents/retargeting_details.h"
@@ skipping 168 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   RenderId render_id(render_process_host_id, routing_id);
   TabAndWindowIdMap::iterator iter = map_.find(render_id);
   if (iter != map_.end()) {
     *tab_id = iter->second.first;
     *window_id = iter->second.second;
     return true;
   }
   return false;
 }
+
+bool ExtensionTabIdMap::GetProcessAndRoutingId(
+    int tab_id, int* render_process_host_id, int* routing_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  for (TabAndWindowIdMap::iterator iter = map_.begin(); iter != map_.end();
+      iter++) {
+    if (iter->second.first == tab_id) {
+      *render_process_host_id = iter->first.first;
+      *routing_id = iter->first.second;
+    }
+    return true;
+  }
+  return false;
+}