Send screenshots back to the client for debugging

chrome/browser/automation/testing_automation_provider.h

Index: chrome/browser/automation/testing_automation_provider.h
diff --git a/chrome/browser/automation/testing_automation_provider.h b/chrome/browser/automation/testing_automation_provider.h
index 762f9c08e43861ac515d07f74afe9247732739d8..185145fa10b04a629dba2d3fe9bdbcaeeaf41171 100644
--- a/chrome/browser/automation/testing_automation_provider.h
+++ b/chrome/browser/automation/testing_automation_provider.h
@@ -862,6 +862,14 @@ class TestingAutomationProvider : public AutomationProvider,
   //   output: { "title": "Google" }
   void GetTabTitleJSON(DictionaryValue* args, IPC::Message* reply_message);
 
+  // Captures the entire page of the the specified tab, including the
+  // non-visible portions of the page, and saves the PNG to a file.
+  // Example:
+  //   input: { "windex": 1, "tab_index": 1, "Path:"file location"}
+  //   output: { "success": true }
+  void CaptureEntirePageJSON(
+      DictionaryValue* args, IPC::Message* reply_message);
+
   // Gets the cookies for the given URL. Uses the JSON interface.
   // Example:
   //   input: { "windex": 1, "tab_index": 1, "url": "http://www.google.com" }