WebView: Add channel info for UMA

android_webview/browser/aw_metrics_service_client_impl.h

Index: android_webview/browser/aw_metrics_service_client_impl.h
diff --git a/android_webview/browser/aw_metrics_service_client_impl.h b/android_webview/browser/aw_metrics_service_client_impl.h
index 33ab2cb714232ac775db944e50f462d0a6dcc82a..ccce6c23c4d6f115e56089ba99673477d9204abe 100644
--- a/android_webview/browser/aw_metrics_service_client_impl.h
+++ b/android_webview/browser/aw_metrics_service_client_impl.h
@@ -13,6 +13,7 @@
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "components/metrics/metrics_log_uploader.h"
+#include "components/version_info/channel.h"
 
 namespace metrics {
 class MetricsStateManager;
@@ -72,6 +73,7 @@ class AwMetricsServiceClientImpl : public AwMetricsServiceClient {
   net::URLRequestContextGetter* request_context_;
   std::unique_ptr<metrics::MetricsStateManager> metrics_state_manager_;
   std::unique_ptr<metrics::MetricsService> metrics_service_;
+  version_info::Channel channel_;
 
   DISALLOW_COPY_AND_ASSIGN(AwMetricsServiceClientImpl);
 };