EDK: Change Awakable::Awake()'s context, etc., to be a uint64_t.

mojo/edk/system/message_pipe_unittest.cc

 // Copyright 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 "mojo/edk/system/message_pipe.h"
 
 #include "mojo/edk/system/waiter.h"
 #include "mojo/edk/system/waiter_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 442 matching lines @@
   EXPECT_EQ(0u, hss.satisfiable_signals);
 
   mp->Close(1);
 }
 
 TEST(MessagePipeTest, ThreadedWaiting) {
   int32_t buffer[1];
   const uint32_t kBufferSize = static_cast<uint32_t>(sizeof(buffer));
 
   MojoResult result;
-  uint32_t context;
+  uint64_t context;
 
   // Write to wake up waiter waiting for read.
   {
     auto mp = MessagePipe::CreateLocalLocal();
     test::SimpleWaiterThread thread(&result, &context);
 
     thread.waiter()->Init();
     ASSERT_EQ(MOJO_RESULT_OK,
               mp->AddAwakable(1, thread.waiter(), MOJO_HANDLE_SIGNAL_READABLE,
                               1, nullptr));
@@ skipping 88 matching lines @@
     mp->CancelAllState(1);
     mp->Close(1);
   }  // Joins |thread|.
   EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, result);
   EXPECT_EQ(4u, context);
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo