[Chromecast] Add metric reporting to ConnectivityCheckerImpl

base/allocator/allocator_shim_unittest.cc

 // Copyright 2016 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/allocator/allocator_shim.h"
 
 #include <malloc.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ skipping 140 matching lines @@
   uint64_t ignored;
   uint8_t ignored_3;
 };
 
 class ThreadDelegateForNewHandlerTest : public PlatformThread::Delegate {
  public:
   ThreadDelegateForNewHandlerTest(WaitableEvent* event) : event_(event) {}
 
   void ThreadMain() override {
     event_->Wait();
-    void* res = realloc(reinterpret_cast<void*>(0x42ul), 1);
+
+    // volatile to ensure the compiler doesn't optimize away the equality check
+    void* volatile res = realloc(reinterpret_cast<void*>(0x42ul), 1);
     EXPECT_EQ(0x42u, reinterpret_cast<uintptr_t>(res));
   }
 
  private:
   WaitableEvent* event_;
 };
 
 AllocatorShimTest* AllocatorShimTest::instance_ = nullptr;
 
 AllocatorDispatch g_mock_dispatch = {
@@ skipping 143 matching lines @@
   event.Signal();
   for (int i = 0; i < kNumThreads; ++i)
     PlatformThread::Join(threads[i]);
   RemoveAllocatorDispatchForTesting(&g_mock_dispatch);
   ASSERT_EQ(kNumThreads, GetNumberOfNewHandlerCalls());
 }
 
 }  // namespace
 }  // namespace allocator
 }  // namespace base