Refactor VariationsSeedProcessor to add ProcessedStudy struct.

components/variations/processed_study.h

Index: components/variations/processed_study.h
===================================================================
--- components/variations/processed_study.h	(revision 0)
+++ components/variations/processed_study.h	(working copy)
@@ -0,0 +1,34 @@
+// Copyright 2013 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_VARIATIONS_PROCESSED_STUDY_H_
+#define COMPONENTS_VARIATIONS_PROCESSED_STUDY_H_
+
+#include "base/metrics/field_trial.h"
+
+namespace chrome_variations {
+
+class Study;
+
+// Wrapper over Study with extra information computed during pre-processing,
+// such as whether the study is expired and its total probability.
+struct ProcessedStudy {
+  ProcessedStudy(const Study* study,
+                 base::FieldTrial::Probability total_probability,
+                 bool is_expired);
+  ~ProcessedStudy();
+
+  // Corresponding Study object. Weak reference.
+  const Study* study;
+
+  // Computed total group probability for the study.
+  base::FieldTrial::Probability total_probability;
+
+  // Whether the study is expired.
+  bool is_expired;
+};
+
+}  // namespace chrome_variations
+
+#endif  // COMPONENTS_VARIATIONS_PROCESSED_STUDY_H_