Send compressed histograms with system logs when sending feedback.

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

Index: chrome/browser/extensions/api/feedback_private/feedback_service.h
diff --git a/chrome/browser/extensions/api/feedback_private/feedback_service.h b/chrome/browser/extensions/api/feedback_private/feedback_service.h
index 1bb85bffdf096261aaeee7d0bc0502094997acad..49ff614838ef6f9bfcfd0ecd89739b6f05861e65 100644
--- a/chrome/browser/extensions/api/feedback_private/feedback_service.h
+++ b/chrome/browser/extensions/api/feedback_private/feedback_service.h
@@ -44,7 +44,7 @@ class FeedbackService {
                             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.
@@ -52,6 +52,9 @@ class FeedbackService {
   virtual void GetSystemInformation(
       const GetSystemInformationCallback& callback) = 0;
 
+  // Gets the histograms in JSON.
+  virtual void GetHistograms(std::string* histograms) = 0;
+
  protected:
   FeedbackService();