Consolidate testcontainer used by WebDriver test

core/src/test/java/google/registry/webdriver/DockerWebDriverRule.java

@@ -26,6 +26,7 @@
 import org.openqa.selenium.chrome.ChromeOptions;
 import org.openqa.selenium.remote.RemoteWebDriver;
 import org.testcontainers.containers.BindMode;
+import org.testcontainers.containers.BrowserWebDriverContainer;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.wait.strategy.Wait;
 
@@ -39,8 +40,11 @@ class DockerWebDriverRule extends ExternalResource {
   private WebDriver webDriver;
 
   private static URL getWebDriverUrl() {
+
+    // BrowserWebDriverContainer will try and match the version of the Dockerized
+    // browser to whichever version of Selenium is found on the classpath
     GenericContainer container =
-        new GenericContainer("selenium/standalone-chrome:3.141.59-mercury")
+        new BrowserWebDriverContainer()
             .withFileSystemBind("/dev/shm", "/dev/shm", BindMode.READ_WRITE)
             .withExposedPorts(CHROME_DRIVER_SERVICE_PORT)
             .waitingFor(Wait.forHttp("/").withStartupTimeout(Duration.of(20, ChronoUnit.SECONDS)));

core/src/test/java/google/registry/webdriver/README.md

@@ -1,7 +1,7 @@
 # Webdriver Tests
 
 This is the home of the Nomulus webdriver tests. These tests run our user-facing
-HTML/JavaScript code in the context of a set of common browsers. See the[Webdriver documentation](https://www.seleniumhq.org/docs/03_webdriver.jsp)
+HTML/JavaScript code in the context of a set of common browsers. See the [Webdriver documentation](https://www.seleniumhq.org/docs/03_webdriver.jsp)
 for more information on using webdriver.
 
 ## My Screenshot Tests are Failing!
@@ -12,7 +12,7 @@ for more information on using webdriver.
 2. Missing golden images
   * If you added a new test using screenshot comparison, you have to generate
     the golden image for that test in advance and copy it to
-    [goldens/](https://github.com/google/nomulus/tree/master/javatests/google/registry/webdriver/goldens)
+    [goldens/](https://github.com/google/nomulus/tree/master/core/src/test/java/google/registry/webdriver/goldens)
     folder. There
     is an auxiliary Gradle build task to help with this, and here are some examples:
     ```shell
@@ -23,7 +23,7 @@ for more information on using webdriver.
     # Generate the golden image for a certain test
     $ ./gradlew :core:generateGoldenImages \
       --tests "google.registry.webdriver.OteSetupConsoleScreenshotTest.get_owner_fails"
-    ```-webkit-transition
+    ```
 3. Screenshot differs by X pixels
   * If you made any change to the existing test and expected to affect the web page,
     the screenshot should be different from the previously generated golden image.

core/src/test/java/google/registry/webdriver/WebDriverPlusScreenDifferRule.java

@@ -58,7 +58,7 @@ public final class WebDriverPlusScreenDifferRule extends ExternalResource
   // the sum of the absolute difference between the values of the RGB channels. So a 120,30,200
   // reference pixel and a 122,31,193 result pixel have a difference of 10, and would be considered
   // identical if MAX_COLOR_DIFF=10
-  private static final int MAX_COLOR_DIFF = 10;
+  private static final int MAX_COLOR_DIFF = 20;
 
   // Percent of pixels that are allowed to be different (more than the MAX_COLOR_DIFF) between the
   // images while still considering the test to have passed. Useful if there are a very small