Splitting the concept of UMA consent, and should UMA report.

components/metrics/enabled_state_provider.h

Index: components/metrics/enabled_state_provider.h
diff --git a/components/metrics/enabled_state_provider.h b/components/metrics/enabled_state_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..cc05785f6d3cf92d772adc2325144af6facc8c0c
--- /dev/null
+++ b/components/metrics/enabled_state_provider.h
@@ -0,0 +1,25 @@
+// 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.
+
+#ifndef COMPONENTS_METRICS_ENABLED_STATE_PROVIDER_H_
+#define COMPONENTS_METRICS_ENABLED_STATE_PROVIDER_H_
+
+namespace metrics {
+
+// An interface that provides whether metrics should be reported.
+class EnabledStateProvider {
+ public:
+  virtual ~EnabledStateProvider() {}
+
+  // Indicates that the user has provided consent to collect and report metrics.
+  virtual bool IsConsentGiven() = 0;
+
+  // Should collection and reporting be enabled. This should depend on consent
+  // being given.

[Alexei Svitkine (slow), 2016/05/11 17:16:28]

Nit: Please expand comment to shed light of why this would be different. Suggest
just mentioning sampling as an example and explaining.

[jwd, 2016/05/11 18:31:38]

Done.

+  virtual bool IsReportingEnabled();
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_ENABLED_STATE_PROVIDER_H_