Implement per-test timeout for UI tests.

chrome/browser/automation/automation_provider.h

Index: chrome/browser/automation/automation_provider.h
diff --git a/chrome/browser/automation/automation_provider.h b/chrome/browser/automation/automation_provider.h
index 7728e4e3f44722286f239975345fa92984de53e9..b7fccd067eb1040b29e29b2b8a0f70e2c5b6f191 100644
--- a/chrome/browser/automation/automation_provider.h
+++ b/chrome/browser/automation/automation_provider.h
@@ -300,6 +300,8 @@ class AutomationProvider : public base::RefCounted<AutomationProvider>,
                           gfx::NativeWindow* tab_window,
                           int* tab_handle);
 
+  void QuitAfterTimeout(int timeout_ms);
+
   void NavigateInExternalTab(
       int handle, const GURL& url,
       AutomationMsg_NavigationResponseValues* status);