Add DataReductionProxy IPC to determine if the Data Reduction Proxy was used.

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
index d6fdd48a6a8a6bcc7ccdcf85c34822fba305ed24..5570deb4a6a0f1a960794a71f841f316b4c74362 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
@@ -169,6 +169,12 @@ class DataReductionProxySettings {
     return data_reduction_proxy_service_.get();
   }
 
+  // Returns the |DataReductionProxyConfig| being used. May be null if
+  // InitDataReductionProxySettings has not been called.
+  DataReductionProxyConfig* Config() const {
+    return config_;
+  }
+
   // Permits changing the underlying |DataReductionProxyConfig| without running
   // the initialization loop.
   void ResetConfigForTest(DataReductionProxyConfig* config) {
@@ -176,12 +182,6 @@ class DataReductionProxySettings {
   }
 
  protected:
-  // Returns the |DataReductionProxyConfig| being used. May be null if
-  // InitDataReductionProxySettings has not been called.
-  DataReductionProxyConfig* Config() const {
-    return config_;
-  }
-
   void InitPrefMembers();
 
   void UpdateConfigValues();