RTCStatsMember<bool> and RTCStatsMember<std::vector<bool>> added.
RTCStatsMemberInterface::Type's kBool and kSequenceBool.

This means that RTCStats-derived classes ("RTCStats-derived
dictionaries"[1]) can contain boolean and sequence of boolean members.

[1] https://w3c.github.io/webrtc-stats/

BUG=chromium:627816
NOTRY=True

Review-Url: https://codereview.webrtc.org/2387343002
Cr-Commit-Position: refs/heads/master@{#14509}
diff --git a/webrtc/stats/rtcstats.cc b/webrtc/stats/rtcstats.cc
index 6b6c437..543ef42 100644
--- a/webrtc/stats/rtcstats.cc
+++ b/webrtc/stats/rtcstats.cc
@@ -93,6 +93,8 @@
     return to_str;                                                             \
   }
 
+WEBRTC_DEFINE_RTCSTATSMEMBER(bool, kBool, false, false,
+                             rtc::ToString(value_));
 WEBRTC_DEFINE_RTCSTATSMEMBER(int32_t, kInt32, false, false,
                              rtc::ToString(value_));
 WEBRTC_DEFINE_RTCSTATSMEMBER(uint32_t, kUint32, false, false,
@@ -106,6 +108,9 @@
 WEBRTC_DEFINE_RTCSTATSMEMBER(std::string, kString, false, true,
                              value_);
 WEBRTC_DEFINE_RTCSTATSMEMBER(
+    std::vector<bool>, kSequenceBool, true, false,
+    VectorToString(value_));
+WEBRTC_DEFINE_RTCSTATSMEMBER(
     std::vector<int32_t>, kSequenceInt32, true, false,
     VectorToString(value_));
 WEBRTC_DEFINE_RTCSTATSMEMBER(