Send compressed histograms with system logs when sending feedback.

chrome/browser/extensions/api/feedback_private/feedback_service.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_FEEDBACK_PRIVATE_FEEDBACK_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FEEDBACK_PRIVATE_FEEDBACK_SERVICE_H_
 
 #include <vector>
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ skipping 26 matching lines @@
                                  const std::string& value);
 
   virtual ~FeedbackService();
 
   // Sends a feedback report.
   virtual void SendFeedback(Profile* profile,
                             scoped_refptr<FeedbackData> feedback_data,
                             const SendFeedbackCallback& callback);
 
   // Platform specific methods:
-  // Get's the email address of the logged in user.
+  // Gets the email address of the logged in user.
   virtual std::string GetUserEmail() = 0;
 
   // Start to gather system information.
   // The |callback| will be invoked once the query is completed.
   virtual void GetSystemInformation(
       const GetSystemInformationCallback& callback) = 0;
 
+  // Gets the histograms in JSON.
+  virtual void GetHistograms(std::string* histograms) = 0;
+
  protected:
   FeedbackService();
 
   // Used to get a weak ptr for a derived class instance.
   virtual base::WeakPtr<FeedbackService> GetWeakPtr() = 0;
 
   // Callbacks to receive blob data.
   void AttachedFileCallback(scoped_ptr<std::string> data);
   void ScreenshotCallback(scoped_ptr<std::string> data);
 
   // Checks if we have read all the blobs we need to; signals the feedback
   // data object once all the requisite data has been populated.
   void CompleteSendFeedback();
 
   GetSystemInformationCallback system_information_callback_;
   SendFeedbackCallback send_feedback_callback_;
 
   scoped_refptr<FeedbackData> feedback_data_;
 
   DISALLOW_COPY_AND_ASSIGN(FeedbackService);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FEEDBACK_PRIVATE_FEEDBACK_SERVICE_H_