Send screenshots back to the client for debugging

chrome/test/webdriver/automation.h

Index: chrome/test/webdriver/automation.h
diff --git a/chrome/test/webdriver/automation.h b/chrome/test/webdriver/automation.h
index 1fedda6a342ac5f442e06c28a74e1d74be3cf7fb..95b1436603c1d4c47bdf6cf7f2f35244be631121 100644
--- a/chrome/test/webdriver/automation.h
+++ b/chrome/test/webdriver/automation.h
@@ -59,6 +59,11 @@ class Automation {
   // been processed by the web page.
   void SendWebKeyEvent(int tab_id, const WebKeyEvent& key_event, bool* success);
 
+  // Returns a string containing the raw binary data of a PNG image of the
+  // tab requested.  The PNG will contain the entire page, including what
+  // is not in the current view on the screen.
+  void CaptureEntirePageAsPNG(int tab_id, const FilePath& path, bool* success);
+
   void NavigateToURL(int tab_id, const std::string& url, bool* success);
   void GoForward(int tab_id, bool* success);
   void GoBack(int tab_id, bool* success);