Add Windows 10 build number to user-agent

content/common/user_agent.cc

Index: content/common/user_agent.cc
diff --git a/content/common/user_agent.cc b/content/common/user_agent.cc
index 5602261f68182583cd7840e983558b86d096bb0c..ee6e9011412f3407b627fcc82b57250db77c4deb 100644
--- a/content/common/user_agent.cc
+++ b/content/common/user_agent.cc
@@ -63,6 +63,15 @@ std::string BuildOSCpuInfo() {
 #endif
 
 #if defined(OS_WIN)
+  std::string windows_version_str;
+  if (os_major_version >= 10) {
+    base::StringAppendF(&windows_version_str, "%d.%d.%d",
+      os_major_version, os_minor_version, os_bugfix_version);
+  } else {
+    base::StringAppendF(
+      &windows_version_str, "%d.%d", os_major_version, os_minor_version);
+  }
+
   std::string architecture_token;
   base::win::OSInfo* os_info = base::win::OSInfo::GetInstance();
   if (os_info->wow64_status() == base::win::OSInfo::WOW64_ENABLED) {
@@ -108,9 +117,8 @@ std::string BuildOSCpuInfo() {
   base::StringAppendF(
       &os_cpu,
 #if defined(OS_WIN)
-      "Windows NT %d.%d%s",
-      os_major_version,
-      os_minor_version,
+      "Windows NT %s%s",
+      windows_version_str.c_str(),
       architecture_token.c_str()
 #elif defined(OS_MACOSX)
       "Intel Mac OS X %d_%d_%d",