UMA log for audio_device Init and Start(Playout|Recording). Make Init return a more specific error …

webrtc/system_wrappers/include/metrics.h

 //
 // Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the LICENSE file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS.  All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 //
 
@@ skipping 107 matching lines @@
       webrtc::metrics::HistogramFactoryGetCounts(name, min, max, bucket_count))
 
 // Histogram for percentage (evenly spaced buckets).
 #define RTC_HISTOGRAM_PERCENTAGE(name, sample) \
   RTC_HISTOGRAM_ENUMERATION(name, sample, 101)
 
 // RTC_HISTOGRAM_PERCENTAGE with logging.
 #define RTC_LOGGED_HISTOGRAM_PERCENTAGE(name, sample) \
   RTC_LOGGED_HISTOGRAM_ENUMERATION(name, sample, 101)
 
+// Histogram for booleans.
+#define RTC_HISTOGRAM_BOOLEAN(name, sample) \
+  RTC_HISTOGRAM_ENUMERATION(name, sample, 2)
+
+// RTC_HISTOGRAM_BOOLEAN with logging.
+#define RTC_LOGGED_HISTOGRAM_BOOLEAN(name, sample) \
+  RTC_LOGGED_HISTOGRAM_ENUMERATION(name, sample, 2)
+
 // Histogram for enumerators (evenly spaced buckets).
 // |boundary| should be above the max enumerator sample.
 #define RTC_HISTOGRAM_ENUMERATION(name, sample, boundary) \
   RTC_HISTOGRAM_COMMON_BLOCK(name, sample, false, \
       webrtc::metrics::HistogramFactoryGetEnumeration(name, boundary))
 
 // RTC_HISTOGRAM_ENUMERATION with logging.
 #define RTC_LOGGED_HISTOGRAM_ENUMERATION(name, sample, boundary) \
   RTC_HISTOGRAM_COMMON_BLOCK(name, sample, true, \
       webrtc::metrics::HistogramFactoryGetEnumeration(name, boundary))
@@ skipping 141 matching lines @@
 // Function for adding a |sample| to a histogram.
 // |name| can be used to verify that it matches the histogram name.
 void HistogramAdd(
     Histogram* histogram_pointer, const std::string& name, int sample);
 
 }  // namespace metrics
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_H_