[Chromecast] Add metric reporting to ConnectivityCheckerImpl

base/allocator/allocator_shim_unittest.cc

Index: base/allocator/allocator_shim_unittest.cc
diff --git a/base/allocator/allocator_shim_unittest.cc b/base/allocator/allocator_shim_unittest.cc
index e1a7f53874ea6e472f34d3cbac1c80ae00061e85..776263f91d9f5fa55d2bc9e2e56c34a89147d850 100644
--- a/base/allocator/allocator_shim_unittest.cc
+++ b/base/allocator/allocator_shim_unittest.cc
@@ -158,7 +158,9 @@ class ThreadDelegateForNewHandlerTest : public PlatformThread::Delegate {
 
   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));
   }