Test that simulates touch exploration and checks speech on tabs and also the empty bookmark bar.

chrome/browser/chromeos/accessibility/accessibility_util.cc

Index: chrome/browser/chromeos/accessibility/accessibility_util.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_util.cc b/chrome/browser/chromeos/accessibility/accessibility_util.cc
index 3d2d95d4a1f146a7b5c19e0515ed3129079ba6ff..e5e17d1dbf52011a95065f21feac8ae68eb8a1ca 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_util.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_util.cc
@@ -7,8 +7,13 @@
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/ui/singleton_tabs.h"
+#include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "content/public/test/browser_test_utils.h"
+#include "extensions/browser/extension_host.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/process_manager.h"
 #include "url/gurl.h"
 
 // TODO(yoshiki): move the following method to accessibility_manager.cc and
@@ -38,5 +43,19 @@ void ShowAccessibilityHelp(Browser* browser) {
   chrome::ShowSingletonTab(browser, GURL(chrome::kChromeAccessibilityHelpURL));
 }
 
+
+void SimulateTouchScreenInChromeVoxForTest(content::BrowserContext* profile) {
+  // ChromeVox looks at whether 'ontouchstart' exists to know whether
+  // or not it should respond to hover events. Fake it so that touch
+  // exploration events get spoken.
+  extensions::ExtensionHost* host =
+      extensions::ExtensionSystem::Get(profile)
+          ->process_manager()
+          ->GetBackgroundHostForExtension(
+              extension_misc::kChromeVoxExtensionId);
+  CHECK(content::ExecuteScript(host->host_contents(),
+                               "window.ontouchstart = function() {};"));

[aboxhall, 2014/08/08 17:16:01]

Perhaps to be a little safer:
"if (!('ontouchstart' in window)) window.ontouchstart = function() {};"

[evy, 2014/08/08 18:37:47]

This code was actually moved over from another file - it looks like a way of
executing JavaScript from the browsercontext but I don't fully understand what's
going on.

[aboxhall, 2014/08/08 18:54:30]

Yeah, I did see it in the other file after I made this comment.
Essentially what it's doing is running
https://developer.chrome.com/extensions/tabs#method-executeScript in the
ChromeVox extension background page context, but from C++ instead of JavaScript.
I'm not sure whether it's a risk, but as it is currently you'd be overwriting
window.ontouchstart if it already exists (e.g if this test somehow gets executed
in a context with a touch screen) - probably not actually a problem right now,
but you never know where this method will end up getting used given it's now in
a util file. My suggestion is simply to check for an existing
window.ontouchstart before you set it.

[evy, 2014/08/08 19:15:38]

Makes sense! Thanks for the explanation + suggestion

+}
+
 }  // namespace accessibility
 }  // namespace chromeos