Add ppapi perftests infrastructure, plus a performance test for PPP_Messaging.

ppapi/proxy/ppp_messaging_proxy_perftest.cc

Index: ppapi/proxy/ppp_messaging_proxy_perftest.cc
diff --git a/ppapi/proxy/ppp_messaging_proxy_perftest.cc b/ppapi/proxy/ppp_messaging_proxy_perftest.cc
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index 0000000000000000000000000000000000000000..a58b025763cdc9fdf11ddfa0e823b647aecc4b67
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+++ b/ppapi/proxy/ppp_messaging_proxy_perftest.cc
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+// 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 "base/command_line.h"
+#include "base/perftimer.h"
+#include "base/string_number_conversions.h"
+#include "ppapi/c/ppp_messaging.h"
+#include "ppapi/proxy/ppapi_proxy_test.h"
+#include "ppapi/proxy/serialized_var.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/shared_impl/var_tracker.h"
+
+namespace ppapi {
+namespace proxy {
+namespace {
+
+base::WaitableEvent handle_message_called(false, false);
+
+void HandleMessage(PP_Instance /* instance */, PP_Var message_data) {
+  StringVar* string_var = StringVar::FromPPVar(message_data);
+  DCHECK(string_var);
+  // Retrieve the string to make sure the proxy can't "optimize away" sending
+  // the actual contents of the string (e.g., by doing a lazy retrieve or
+  // something). Note that this test is for performance only, and assumes
+  // other tests check for correctness.
+  std::string s = string_var->value();
+  // Do something simple with the string so the compiler won't complain.
+  if (s.length() > 0)
+    s[0] = 'a';
+  handle_message_called.Signal();
+}
+
+PPP_Messaging ppp_messaging_mock = {
+  &HandleMessage
+};
+
+class PppMessagingPerfTest : public TwoWayTest {
+ public:
+  PppMessagingPerfTest() : TwoWayTest(TwoWayTest::TEST_PPP_INTERFACE) {
+    plugin().RegisterTestInterface(PPP_MESSAGING_INTERFACE,
+                                   &ppp_messaging_mock);
+  }
+};
+
+}  // namespace
+
+// Tests the performance of sending strings through the proxy.
+TEST_F(PppMessagingPerfTest, StringPerformance) {
+  // Grab the host-side proxy of ppp_messaging.
+  const PPP_Messaging* ppp_messaging = static_cast<const PPP_Messaging*>(
+      host().host_dispatcher()->GetProxiedInterface(
+          PPP_MESSAGING_INTERFACE));
+  const PP_Instance kTestInstance = pp_instance();
+  int string_size = 100000;
+  int string_count = 1000;
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line) {
+    if (command_line->HasSwitch("string_size")) {
+      base::StringToInt(command_line->GetSwitchValueASCII("string_size"),
+                        &string_size);
+    }
+    if (command_line->HasSwitch("string_count")) {
+      base::StringToInt(command_line->GetSwitchValueASCII("string_count"),
+                        &string_count);
+    }
+  }
+  // Make a string var of size string_size.
+  const std::string kTestString(string_size, 'a');
+  PerfTimeLogger logger("PppMessagingPerfTest.StringPerformance");
+  for (int i = 0; i < string_count; ++i) {
+    PP_Var host_string = StringVar::StringToPPVar(kTestString);
+    ppp_messaging->HandleMessage(kTestInstance, host_string);
+    handle_message_called.Wait();
+    PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(host_string);
+  }
+}
+
+}  // namespace proxy
+}  // namespace ppapi
+