Adding UMA stats for Blimp Client

blimp/client/core/dummy_blimp_client_context.cc

Index: blimp/client/core/dummy_blimp_client_context.cc
diff --git a/blimp/client/core/dummy_blimp_client_context.cc b/blimp/client/core/dummy_blimp_client_context.cc
index 5ebc115750153102694b621086a8f75005db8528..82b75ea439a5275d2190ef547ddcb23717c18c20 100644
--- a/blimp/client/core/dummy_blimp_client_context.cc
+++ b/blimp/client/core/dummy_blimp_client_context.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "blimp/client/public/compositor/compositor_dependencies.h"
 
@@ -32,7 +33,9 @@ BlimpClientContext* BlimpClientContext::Create(
 #endif  // defined(OS_ANDROID)
 }
 
-DummyBlimpClientContext::DummyBlimpClientContext() : BlimpClientContext() {}
+DummyBlimpClientContext::DummyBlimpClientContext() : BlimpClientContext() {
+  UMA_HISTOGRAM_BOOLEAN("Blimp.Supported", false);
+}
 
 DummyBlimpClientContext::~DummyBlimpClientContext() {}