Implement Chrome Extension TabCapture API.

chrome/browser/extensions/extension_tab_id_map.cc

Index: chrome/browser/extensions/extension_tab_id_map.cc
diff --git a/chrome/browser/extensions/extension_tab_id_map.cc b/chrome/browser/extensions/extension_tab_id_map.cc
index e3c92e1a971930f91c894a2c1b338614a082b8d9..453469f59c0bf2b7c5ab9980eb0299a425712cc9 100644
--- a/chrome/browser/extensions/extension_tab_id_map.cc
+++ b/chrome/browser/extensions/extension_tab_id_map.cc
@@ -186,3 +186,17 @@ bool ExtensionTabIdMap::GetTabAndWindowId(
   }
   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;
+}