Piggybacking simulcast id and ALR experiment id into video content type extension.

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 170 matching lines @@
 
 #define RTC_HISTOGRAMS_ENUMERATION(index, name, sample, boundary) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_ENUMERATION(name, sample, boundary))
 
 #define RTC_HISTOGRAMS_PERCENTAGE(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_PERCENTAGE(name, sample))
 
 #define RTC_HISTOGRAMS_COMMON(index, name, sample, macro_invocation) \
-  do { \
-    switch (index) { \
-      case 0: \
-        macro_invocation; \
-        break; \
-      case 1: \
-        macro_invocation; \
-        break; \
-      case 2: \
-        macro_invocation; \
-        break; \
-      default: \
-        RTC_NOTREACHED(); \
-    } \
+  do {                                                               \
+    switch (index) {                                                 \
+      case 0:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 1:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 2:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 3:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 4:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 5:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 6:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      case 7:                                                        \
+        macro_invocation;                                            \
+        break;                                                       \
+      default:                                                       \
+        RTC_NOTREACHED();                                            \
+    }                                                                \
   } while (0)
 
-
 namespace webrtc {
 namespace metrics {
 
 // Time that should have elapsed for stats that are gathered once per call.
 enum { kMinRunTimeInSeconds = 10 };
 
 class Histogram;
 
 // Functions for getting pointer to histogram (constructs or finds the named
 // histogram).
@@ skipping 16 matching lines @@
 // Returns name of the histogram.
 const std::string& GetHistogramName(Histogram* histogram_pointer);
 
 // Function for adding a |sample| to a histogram.
 void HistogramAdd(Histogram* histogram_pointer, int sample);
 
 }  // namespace metrics
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_H_