Add FeedbackReporter for reporting distillation quality.

components/dom_distiller/core/feedback_reporter.cc

+// Copyright 2014 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.
+
+#include "components/dom_distiller/core/feedback_reporter.h"
+
+#include "base/metrics/histogram.h"
+
+namespace dom_distiller {
+
+FeedbackReporter::FeedbackReporter() {}
+
+FeedbackReporter::~FeedbackReporter() {}
+
+// static
+void FeedbackReporter::ReportQuality(bool good) {
+  UMA_HISTOGRAM_BOOLEAN("DomDistiller.DistillationQuality", good);
+}
+
+}  // namespace dom_distiller