ChromeDriver should be able to focus on a frame using its frame element,

chrome/test/webdriver/session.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/test/webdriver/session_manager.h"
+#include "chrome/test/webdriver/session.h"
 
 #include <sstream>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ skipping 445 matching lines @@
       "var frame = document.evaluate(xpath, document, null, "
       "XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;"
       "console.info(frame == null ? 'found nothing' : frame);"
       "return frame == null ? null : ((frame.tagName == 'IFRAME' ? "
       "    '/html/body//iframe' : '/html/frameset/frame') + index);";
   ListValue args;
   args.Append(Value::CreateIntegerValue(index));
   return SwitchToFrameWithJavaScriptLocatedFrame(script, &args);
 }
 
+ErrorCode Session::SwitchToFrameWithElement(const WebElementId& element) {
+  // TODO(jleyba): Extract this, and the other frame switch methods to an atom.
+  std::string script =
+      "var element = arguments[0];"
+      "console.info('Attempting to switch to ' + element);"
+      "if (element.nodeType != 1 || !/^i?frame$/i.test(element.tagName)) {"
+      "  console.info('Element is not a frame: ' + element + "
+      "' {nodeType:' + element.nodeType + ',tagName:' + element.tagName + '}');"
+      "  return null;"
+      "}"
+      "for (var i = 0; i < window.frames.length; i++) {"
+      "  if (element.contentWindow == window.frames[i]) {"
+      "    return '(//iframe|//frame)[' + (i + 1) + ']';"
+      "  }"
+      "}"
+      "console.info('Frame is not connected to this DOM tree');"
+      "return null;";
+
+  ListValue args;
+  args.Append(element.ToValue());
+  return SwitchToFrameWithJavaScriptLocatedFrame(script, &args);
+}
+
 void Session::SwitchToTopFrame() {
   current_target_.frame_path = FramePath();
 }
 
 bool Session::CloseWindow() {
   bool success = false;
   RunSessionTask(NewRunnableMethod(
       automation_.get(),
       &Automation::CloseTab,
       current_target_.window_id,
@@ skipping 381 matching lines @@
   if (!loc_dict->GetInteger("x", &x) ||
       !loc_dict->GetInteger("y", &y)) {
     LOG(ERROR) << "Location atom returned bad coordinate dictionary";
     code = kUnknownError;
   }
   *location = gfx::Point(x, y);
   return kSuccess;
 }
 
 }  // namespace webdriver