Send screenshots back to the client for debugging

chrome/test/webdriver/automation.cc

Index: chrome/test/webdriver/automation.cc
diff --git a/chrome/test/webdriver/automation.cc b/chrome/test/webdriver/automation.cc
index ed6fa93ea21cec5b1cceab76532e94076e7bebd8..b384abb676dc4cb1e72baed4d6ef3245842b0c39 100644
--- a/chrome/test/webdriver/automation.cc
+++ b/chrome/test/webdriver/automation.cc
@@ -245,6 +245,18 @@ void Automation::SendWebKeyEvent(int tab_id,
   }
 }
 
+void Automation::CaptureEntirePageAsPNG(int tab_id,
+                                        const FilePath& path,
+                                        bool* success) {
+  TabProxy* tab = GetTabById(tab_id);
+  if (!tab) {
+    *success = false;
+    return;
+  }
+
+  *success = tab->CaptureEntirePageAsPNG(path);
+}
+
 void Automation::NavigateToURL(int tab_id,
                                const std::string& url,
                                bool* success) {