Add a new google bot user agent format

Author: Aaron Raddon

all_test.go

@@ -34,6 +34,11 @@ var uastrings = []struct {
 		ua:       "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
 		expected: "Mozilla:5.0 Browser:Googlebot-2.1 Bot:true Mobile:true",
 	},
+	{
+		title:    "GoogleBotEmulateMozilla",
+		ua:       "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36",
+		expected: "Mozilla:5.0 Browser:Googlebot-2.1 Bot:true Mobile:false",
+	},
 	{
 		title:    "BingBot",
 		ua:       "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)",

bot.go

@@ -22,6 +22,8 @@ func getFromSite(comment []string) string {
 	idx := 2
 	if len(comment) < 3 {
 		idx = 0
+	} else if len(comment) == 4 {
+		idx = 3
 	}
 
 	// Pick the site.
@@ -34,7 +36,7 @@ func getFromSite(comment []string) string {
 
 		// This is a large comment, usually the name will be in the previous
 		// field of the comment.
-		return strings.TrimSpace(comment[1])
+		return strings.TrimSpace(comment[idx-1])
 	}
 	return ""
 }

browser.go

@@ -76,6 +76,13 @@ func (p *UserAgent) detectBrowser(sections []section) {
 					} else {
 						p.browser.Name = "Safari"
 					}
+					// Its possible the google-bot emulates these now
+					for _, comment := range engine.comment {
+						if len(comment) > 5 && strings.HasPrefix(comment, "Googlebot") {
+							p.undecided = true
+							break
+						}
+					}
 				}
 			} else if engine.name == "Gecko" {
 				name := sections[2].name