Reland of OOPIF: Route keyboard events to focused frame in the browser process.

content/test/data/page_with_input_field.html

Index: content/test/data/page_with_input_field.html
diff --git a/content/test/data/page_with_input_field.html b/content/test/data/page_with_input_field.html
index 494456a15609344cf5d3da74af23c0c5e764a16d..87426ac2e79c87fb892dd847edf3ed3b04006163 100644
--- a/content/test/data/page_with_input_field.html
+++ b/content/test/data/page_with_input_field.html
@@ -6,6 +6,11 @@
 function focusInputField() {
   var inputField = document.getElementById("text-field");
   inputField.focus();
+}
+
+function getInputFieldText() {
+  var inputField = document.getElementById("text-field");
+  return inputField.value;
 }
 
 function onInputFocus() {