[WPT] Add automated manual test for InputEvent typing

third_party/WebKit/LayoutTests/external/wpt_automation/input-events/input-events-typing-data-manual-automation.js

Index: third_party/WebKit/LayoutTests/external/wpt_automation/input-events/input-events-typing-data-manual-automation.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt_automation/input-events/input-events-typing-data-manual-automation.js b/third_party/WebKit/LayoutTests/external/wpt_automation/input-events/input-events-typing-data-manual-automation.js
new file mode 100644
index 0000000000000000000000000000000000000000..afc69a00a07ab598efab9c069185c265ddca3301
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt_automation/input-events/input-events-typing-data-manual-automation.js
@@ -0,0 +1,15 @@
+importAutomationScript('/input-events/inputevent_common_input.js');
+
+function inject_input() {
+  return focus('#plain').then(() => {
+    return keyDown('a');
+  }).then(() => {
+    return keyDown('b');
+  }).then(() => {
+    return focus('#rich');
+  }).then(() => {
+    return keyDown('c');
+  }).then(() => {
+    return keyDown('d');
+  });
+}