Implement sendKeys webdriver API in ChromeDriver.

chrome/test/webdriver/session.h

Index: chrome/test/webdriver/session.h
===================================================================
--- chrome/test/webdriver/session.h	(revision 74135)
+++ chrome/test/webdriver/session.h	(working copy)
@@ -8,6 +8,8 @@
 #include <string>
 
 #include "base/scoped_ptr.h"
+#include "base/string16.h"
+#include "base/values.h"
 #include "chrome/test/webdriver/automation.h"
 #include "chrome/test/webdriver/error_codes.h"
 
@@ -42,6 +44,9 @@
                           const ListValue* const args,
                           Value** value);
 
+  // Send the given keys to the given element dictionary. This function takes
+  // ownership of |element|.
+  ErrorCode SendKeys(DictionaryValue* element, const string16& keys);
 
   bool NavigateToURL(const std::string& url);
   bool GoForward();
@@ -78,6 +83,7 @@
       base::WaitableEvent* done_event);
   void InitOnSessionThread(bool* success);
   void TerminateOnSessionThread();
+  void SendKeysOnSessionThread(const string16& keys, bool* success);
 
   scoped_ptr<Automation> automation_;
   base::Thread thread_;