Fix flaky PPAPITest.FlashClipboard.

ppapi/tests/test_utils.h

 // Copyright (c) 2011 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_TESTS_TEST_UTILS_H_
 #define PPAPI_TESTS_TEST_UTILS_H_
 
 #include <string>
 
 #include "ppapi/c/dev/ppb_testing_dev.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/cpp/completion_callback.h"
 
+// Timeout to wait for some action to complete.
+extern const int kActionTimeoutMs;
+
 const PPB_Testing_Dev* GetTestingInterface();
 std::string ReportError(const char* method, int32_t error);
+void PlatformSleep(int duration_ms);
 
 class TestCompletionCallback {
  public:
   TestCompletionCallback(PP_Instance instance);
   TestCompletionCallback(PP_Instance instance, bool force_async);
 
   // Waits for the callback to be called and returns the
   // result. Returns immediately if the callback was previously called
   // and the result wasn't returned (i.e. each result value received
   // by the callback is returned by WaitForResult() once and only
@@ skipping 12 matching lines @@
 
   bool have_result_;
   int32_t result_;
   bool force_async_;
   bool post_quit_task_;
   unsigned run_count_;
   PP_Instance instance_;
 };
 
 #endif  // PPAPI_TESTS_TEST_UTILS_H_