Send screenshots back to the client for debugging

chrome/test/webdriver/session.h

Index: chrome/test/webdriver/session.h
diff --git a/chrome/test/webdriver/session.h b/chrome/test/webdriver/session.h
index 5969b86e2add0527b9e094f4804c021b8f2f3db6..3c018c7e8ed4ff7bd4b824a4dd3031a54f4fceac 100644
--- a/chrome/test/webdriver/session.h
+++ b/chrome/test/webdriver/session.h
@@ -78,7 +78,6 @@ class Session {
   void MouseClick(const gfx::Point& click, int flags);
   bool MouseMove(const gfx::Point& location);
   bool MouseDrag(const gfx::Point& start, const gfx::Point& end);
-
   bool NavigateToURL(const std::string& url);
   bool GoForward();
   bool GoBack();
@@ -91,6 +90,8 @@ class Session {
              std::string* cookie);
   bool DeleteCookie(const GURL& url, const std::string& cookie_name);
   bool SetCookie(const GURL& url, const std::string& cookie);
+  bool CaptureEntirePageAsPNG(const FilePath& path);
+  bool ScreenshotAsBase64(std::string* screenshot);
 
   // Gets all the currently existing window IDs. Returns true on success.
   bool GetWindowIds(std::vector<int>* window_ids);