Pepper: Log in UMA when an interface is used.

ppapi/proxy/interface_list.h

 // 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.
 
 #ifndef PPAPI_PROXY_INTERFACE_LIST_H_
 #define PPAPI_PROXY_INTERFACE_LIST_H_
 
 #include <map>
 #include <string>
 
@@ skipping 23 matching lines @@
   // This check just allows us to return NULL for interfaces you "shouldn't" be
   // using to keep honest plugins honest.
   static void SetProcessGlobalPermissions(const PpapiPermissions& permissions);
 
   // Looks up the factory function for the given ID. Returns NULL if not
   // supported.
   InterfaceProxy::Factory GetFactoryForID(ApiID id) const;
 
   // Returns the interface pointer for the given browser or plugin interface,
   // or NULL if it's not supported.
-  const void* GetInterfaceForPPB(const std::string& name) const;
+  const void* GetInterfaceForPPB(const std::string& name);
   const void* GetInterfaceForPPP(const std::string& name) const;
 
  private:
   friend class InterfaceListTest;
 
   struct InterfaceInfo {
     InterfaceInfo()
         : iface(NULL),
-          required_permission(PERMISSION_NONE) {
+          required_permission(PERMISSION_NONE),
+          interface_logged(false) {
     }
     InterfaceInfo(const void* in_interface, Permission in_perm)
         : iface(in_interface),
-          required_permission(in_perm) {
+          required_permission(in_perm),
+          interface_logged(false) {
     }
 
     const void* iface;
 
     // Permission required to return non-null for this interface. This will
     // be checked with the value set via SetProcessGlobalPermissionBits when
     // an interface is requested.
     Permission required_permission;
+
+    // Interface usage is logged just once per-interface-per-plugin-process.
+    bool interface_logged;
   };
 
   typedef std::map<std::string, InterfaceInfo> NameToInterfaceInfoMap;
 
   void AddProxy(ApiID id, InterfaceProxy::Factory factory);
 
   // Permissions is the type of permission required to access the corresponding
   // interface. Currently this must be just one unique permission (rather than
   // a bitfield).
   void AddPPB(const char* name, const void* iface, Permission permission);
   void AddPPP(const char* name, const void* iface);
 
+  // Hash the interface name for UMA logging.
+  static int HashInterfaceName(const std::string& name);
+
   PpapiPermissions permissions_;
 
   NameToInterfaceInfoMap name_to_browser_info_;
   NameToInterfaceInfoMap name_to_plugin_info_;
 
   InterfaceProxy::Factory id_to_factory_[API_ID_COUNT];
 
   DISALLOW_COPY_AND_ASSIGN(InterfaceList);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_INTERFACE_LIST_H_