Pepper: Log in UMA when an interface is used.

ppapi/proxy/interface_list_unittest.cc

 // Copyright (c) 2013 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 "base/hash.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/proxy/interface_list.h"
 #include "ppapi/proxy/ppapi_proxy_test.h"
 
 namespace ppapi {
 namespace proxy {
 
 class InterfaceListTest : public PluginProxyTest {
  public:
   // Wrapper function so we can use the private InterfaceList::AddPPB.
   void AddPPB(InterfaceList* list,
               const char* iface_name, void* iface_addr, Permission perm) {
     list->AddPPB(iface_name, iface_addr, perm);
   }
+
+  // Wrapper function so we can use the private
+  // InterfaceList::HashInterfaceName.
+  int HashInterfaceName(const std::string& name) {
+    return InterfaceList::HashInterfaceName(name);
+  }
 };
 
 // Tests looking up a stable interface.
 TEST_F(InterfaceListTest, Stable) {
   InterfaceList list;
   ASSERT_TRUE(list.GetInterfaceForPPB(PPB_CORE_INTERFACE_1_0) != NULL);
   ASSERT_TRUE(list.GetInterfaceForPPB("FakeUnknownInterface") == NULL);
 }
 
 // Tests that dev channel restrictions work properly.
@@ skipping 26 matching lines @@
   ASSERT_TRUE(list.GetInterfaceForPPB(dev_channel_iface_name) == NULL);
   ASSERT_TRUE(list.GetInterfaceForPPB(dev_iface_name) == dev_iface_addr);
 
   InterfaceList::SetProcessGlobalPermissions(
       PpapiPermissions(PERMISSION_DEV | PERMISSION_DEV_CHANNEL));
   ASSERT_TRUE(list.GetInterfaceForPPB(dev_channel_iface_name) ==
               dev_channel_iface_addr);
   ASSERT_TRUE(list.GetInterfaceForPPB(dev_iface_name) == dev_iface_addr);
 }
 
+// Test that the hash function provided by base::Hash is unchanged. This is so
+// that we will generate correct values when logging interface use to UMA.
+TEST_F(InterfaceListTest, InterfaceHash) {
+  EXPECT_EQ(612625164, HashInterfaceName("PPB_InputEvent;1.0"));
+  EXPECT_EQ(79708274, HashInterfaceName("PPB_TCPSocket;1.1"));
+}
+
 }  // namespace proxy
 }  // namespace ppapi