Add recent Win10 versions for populating correct OsInfo (#96)

Author: taste1981

rtc_base/win/windows_version.cc

@@ -207,8 +207,14 @@ Version MajorMinorBuildToVersion(int major, int minor, int build) {
       return VERSION_WIN10_RS4;
     } else if (build < 18362) {
       return VERSION_WIN10_RS5;
-    } else {
+    } else if (build < 18363) {
+      return VERSION_WIN10_19H1;
+    } else if (build < 19041) {
       return VERSION_WIN10_19H1;
+    } else if (build < 19042) {
+      return VERSION_WIN10_20H1;
+    } else {
+      return VERSION_WIN10_20H2;
     }
   } else if (major > 6) {
     RTC_NOTREACHED();

rtc_base/win/windows_version.h

@@ -45,6 +45,9 @@ enum Version {
   VERSION_WIN10_RS4 = 12,   // Redstone 4: Version 1803, Build 17134.
   VERSION_WIN10_RS5 = 13,   // Redstone 5: Version 1809, Build 17763.
   VERSION_WIN10_19H1 = 14,  // 19H1: Version 1903, Build 18362.
+  VERSION_WIN10_19H2 = 15,  // 19H2: Version 1909, Build 18363.
+  VERSION_WIN10_20H1 = 16,  // 20H1: Version 2004, Build 19041.
+  VERSION_WIN10_20H2 = 17,  // 20H2: Version 20H2, Build 19042.
   // On edit, update tools\metrics\histograms\enums.xml "WindowsVersion" and
   // "GpuBlacklistFeatureTestResultsWindows2".
   VERSION_WIN_LAST,  // Indicates error condition.