metrics: Consolidate constants in constants.h.

Instead of hardcoding system specific constants (like path) in
every file, consolidate them into the constants.h.

BUG: 22879597

Change-Id: I615be017774db629bf43398db7f70e9ef7263a52
diff --git a/metrics/constants.h b/metrics/constants.h
new file mode 100644
index 0000000..d44a74f
--- /dev/null
+++ b/metrics/constants.h
@@ -0,0 +1,28 @@
+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef METRICS_CONSTANTS_H_
+#define METRICS_CONSTANTS_H_
+
+namespace metrics {
+static const char kMetricsDirectory[] = "/data/misc/metrics/";
+static const char kMetricsEventsFilePath[] = "/data/misc/metrics/uma-events";
+static const char kMetricsGUIDFilePath[] = "/data/misc/metrics/Sysinfo.GUID";
+static const char kMetricsServer[] = "http://clients4.google.com/uma/v2";
+static const char kConsentFilePath[] = "/data/misc/metrics/enabled";
+}  // namespace metrics
+
+#endif  // METRICS_CONSTANTS_H_