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

chrome/test/webdriver/server.cc

 // Copyright (c) 2010 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 <signal.h>
 #include <stdlib.h>
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
@@ skipping 59 matching lines @@
     break;
   }
 }
 
 namespace webdriver {
 
 void InitCallbacks(struct mg_context* ctx, Dispatcher* dispatcher,
                    base::WaitableEvent* shutdown_event) {
   dispatcher->AddShutdown("/shutdown", shutdown_event);
 
-  dispatcher->Add<CreateSession>(       "/session");
-  dispatcher->Add<BackCommand>(         "/session/*/back");
-  dispatcher->Add<ExecuteCommand>(      "/session/*/execute");
-  dispatcher->Add<ForwardCommand>(      "/session/*/forward");
-  dispatcher->Add<SwitchFrameCommand>(  "/session/*/frame");
-  dispatcher->Add<RefreshCommand>(      "/session/*/refresh");
-  dispatcher->Add<SourceCommand>(       "/session/*/source");
-  dispatcher->Add<SpeedCommand>(        "/session/*/speed");
-  dispatcher->Add<TitleCommand>(        "/session/*/title");
-  dispatcher->Add<URLCommand>(          "/session/*/url");
-  dispatcher->Add<WindowCommand>(       "/session/*/window");
-  dispatcher->Add<WindowHandleCommand>( "/session/*/window_handle");
-  dispatcher->Add<WindowHandlesCommand>("/session/*/window_handles");
-  dispatcher->Add<ImplicitWaitCommand>( "/session/*/timeouts/implicit_wait");
-
-  // Cookie functions.
-  dispatcher->Add<CookieCommand>(     "/session/*/cookie");
-  dispatcher->Add<NamedCookieCommand>("/session/*/cookie/*");
+  dispatcher->Add<CreateSession>("/session");
 
   // WebElement commands
   dispatcher->Add<FindOneElementCommand>(  "/session/*/element");
   dispatcher->Add<FindManyElementsCommand>("/session/*/elements");
   dispatcher->Add<ActiveElementCommand>(   "/session/*/element/active");
   dispatcher->Add<FindOneElementCommand>(  "/session/*/element/*/element");
   dispatcher->Add<FindManyElementsCommand>("/session/*/elements/*/elements");
   dispatcher->Add<ElementAttributeCommand>("/session/*/element/*/attribute/*");
   dispatcher->Add<ElementCssCommand>(      "/session/*/element/*/css/*");
   dispatcher->Add<ElementClearCommand>(    "/session/*/element/*/clear");
   dispatcher->Add<ElementDisplayedCommand>("/session/*/element/*/displayed");
   dispatcher->Add<ElementEnabledCommand>(  "/session/*/element/*/enabled");
   dispatcher->Add<ElementEqualsCommand>(   "/session/*/element/*/equals/*");
   dispatcher->Add<ElementLocationCommand>( "/session/*/element/*/location");
   dispatcher->Add<ElementLocationInViewCommand>(
       "/session/*/element/*/location_in_view");
   dispatcher->Add<ElementNameCommand>(    "/session/*/element/*/name");
   dispatcher->Add<ElementSelectedCommand>("/session/*/element/*/selected");
   dispatcher->Add<ElementSizeCommand>(    "/session/*/element/*/size");
   dispatcher->Add<ElementSubmitCommand>(  "/session/*/element/*/submit");
   dispatcher->Add<ElementTextCommand>(    "/session/*/element/*/text");
   dispatcher->Add<ElementToggleCommand>(  "/session/*/element/*/toggle");
   dispatcher->Add<ElementValueCommand>(   "/session/*/element/*/value");
 
   // Mouse Commands
   dispatcher->Add<ClickCommand>("/session/*/element/*/click");
   dispatcher->Add<DragCommand>( "/session/*/element/*/drag");
   dispatcher->Add<HoverCommand>("/session/*/element/*/hover");
 
+  // All session based commands should be listed after the element based
+  // commands to avoid potential mapping conflicts from an overzealous
+  // wildcard match. For example, /session/*/title maps to the handler to
+  // fetch the page title. If mapped first, this would overwrite the handler
+  // for /session/*/element/*/attribute/title, which should fetch the title
+  // attribute of the element.
+  dispatcher->Add<BackCommand>(         "/session/*/back");
+  dispatcher->Add<ExecuteCommand>(      "/session/*/execute");
+  dispatcher->Add<ForwardCommand>(      "/session/*/forward");
+  dispatcher->Add<SwitchFrameCommand>(  "/session/*/frame");
+  dispatcher->Add<RefreshCommand>(      "/session/*/refresh");
+  dispatcher->Add<SourceCommand>(       "/session/*/source");
+  dispatcher->Add<SpeedCommand>(        "/session/*/speed");
+  dispatcher->Add<TitleCommand>(        "/session/*/title");
+  dispatcher->Add<URLCommand>(          "/session/*/url");
+  dispatcher->Add<WindowCommand>(       "/session/*/window");
+  dispatcher->Add<WindowHandleCommand>( "/session/*/window_handle");
+  dispatcher->Add<WindowHandlesCommand>("/session/*/window_handles");
+  dispatcher->Add<ImplicitWaitCommand>( "/session/*/timeouts/implicit_wait");
+
+  // Cookie functions.
+  dispatcher->Add<CookieCommand>(     "/session/*/cookie");
+  dispatcher->Add<NamedCookieCommand>("/session/*/cookie/*");
+
   // Commands that have not been implemented yet. We list these out explicitly
   // so that tests that attempt to use them fail with a meaningful error.
   dispatcher->SetNotImplemented("/session/*/execute_async");
   dispatcher->SetNotImplemented("/session/*/timeouts/async_script");
   dispatcher->SetNotImplemented("/session/*/screenshot");
 
   // Since the /session/* is a wild card that would match the above URIs, this
   // line MUST be the last registered URI with the server.
   dispatcher->Add<SessionWithID>("/session/*");
 }
@@ skipping 102 matching lines @@
 
   // Run until we receive command to shutdown.
   shutdown_event.Wait();
 
   // We should not reach here since the service should never quit.
   // TODO(jmikhail): register a listener for SIGTERM and break the
   // message loop gracefully.
   mg_stop(ctx);
   return (EXIT_SUCCESS);
 }