Update DataReductionProxyNetworkDelegate/BypassStats to post tasks safely.

components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h
index 1760c10be9d8b32f5a65fb2429f209501b14a82a..bf44a458b90e79b4e3948663e7f8f9b1269ea819 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h
@@ -10,6 +10,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
 class GURL;
@@ -66,6 +67,16 @@ class DataReductionProxyService : public base::NonThreadSafe,
       scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
       const base::TimeDelta& commit_delay);
 
+  // Records daily data savings statistics in |compression_stats_|.
+  void UpdateContentLengths(int received_content_length,
+                            int original_content_length,
+                            bool data_reduction_proxy_enabled,
+                            DataReductionProxyRequestType request_type);
+
+  // Records whether the Data Reduction Proxy is unreachable or not.
+  void SetUnreachable(bool unreachable);
+
+  // Accessor methods.
   DataReductionProxyCompressionStats* compression_stats() const {
     return compression_stats_.get();
   }