Addition of chromedp-proxy, fixing SendKeys, more

- Adding chromedp-proxy command to help record chrome sessions
- Changing the headless writeup to point to the knq chrome-headless
  docker image
- Fixing issues with SendKeys action (should correctly work for all
  well known keys)
- Updated to latest Chrome protocol.json and re-generated API
- Other minor fixes

examples/headless/.gitignore

@@ -1,2 +1,3 @@
 headless
 headless.exe
+*.png

examples/headless/README.md

@@ -1,16 +1,16 @@
 # About headless
 
 This is a version of the simple example but with the chromedp settings changed
-to use the docker [yukinying/chrome-headless](yukinying/chrome-headless) image.
+to use the docker [knqz/chrome-headless](https://hub.docker.com/r/knqz/chrome-headless/) image.
 
 ## Running
 
 ```sh
 # retrieve docker image
-docker pull yukinying/chrome-headless
+docker pull knqz/chrome-headless
 
-# start docker headless
-docker run -i -t --shm-size=256m --rm --name=chrome-headless -p=127.0.0.1:9222:9222 yukinying/chrome-headless about:blank
+# start chrome-headless
+docker run -d -p 9222:9222 --rm --name chrome-headless knqz/chrome-headless
 
 # run chromedp headless example
 go build && ./headless

examples/headless/main.go

@@ -42,9 +42,8 @@ func googleSearch(q, text string, site, res *string) cdp.Tasks {
 		cdp.Navigate(`https://www.google.com`),
 		cdp.Sleep(2 * time.Second),
 		cdp.WaitVisible(`#hplogo`, cdp.ByID),
-		cdp.SendKeys(`#lst-ib`, q, cdp.ByID),
-		cdp.Click(`input[name="btnK"]`, cdp.ByQuery),
-		cdp.WaitNotVisible(`input[name="btnI"]`, cdp.ByQuery),
+		cdp.SendKeys(`#lst-ib`, q+"\n", cdp.ByID),
+		cdp.WaitVisible(`#res`, cdp.ByID),
 		cdp.Text(sel, res),
 		cdp.Click(sel),
 		cdp.Sleep(2 * time.Second),