Chromecast: adds class to help record complex histograms.

chromecast/media/cma/test/run_all_unittests.cc

Index: chromecast/media/cma/test/run_all_unittests.cc
diff --git a/chromecast/media/cma/test/run_all_unittests.cc b/chromecast/media/cma/test/run_all_unittests.cc
index 0f7d04816ee9cd6f204c7487b511dfadcbf6b041..2b4a722e45f40ba78c08cccfb252ab97810b75ac 100644
--- a/chromecast/media/cma/test/run_all_unittests.cc
+++ b/chromecast/media/cma/test/run_all_unittests.cc
@@ -6,6 +6,7 @@
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_suite.h"
 #include "build/build_config.h"
+#include "chromecast/base/metrics/cast_metrics_test_helper.h"
 #include "media/base/media.h"
 
 #if defined(OS_ANDROID)
@@ -26,6 +27,10 @@ void CmaTestSuite::Initialize() {
   // Run TestSuite::Initialize first so that logging is initialized.
   base::TestSuite::Initialize();
 
+  // Some of the chromecast media unit tests require a metrics helper instance.
+  // Provide a fake one.
+  chromecast::metrics::InitializeMetricsHelperForTesting();
+
   // Initialize the FFMpeg library.
   // Note: at this time, AtExitManager is already present.
   media::InitializeMediaLibraryForTesting();