Add probe to warm data reduction proxy

components/data_reduction_proxy/browser/data_reduction_proxy_params.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_params.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_params.h b/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
index 0285001a35e2868c084aa0d73318d21b27b5b9c2..5ae00b839485b3eed085aeecb62aeacdc5371a21 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
@@ -58,8 +58,8 @@ class DataReductionProxyParams {
   // bypassed or disabled. If |kAlternativeAllowed| then an alternative proxy
   // configuration is allowed to be used. This alternative configuration would
   // replace the primary and fallback proxy configurations if enabled. Finally
-  // if |kPromoAllowed|, the client may show a promotion for the data
-  // reduction proxy.
+  // if |kPromoAllowed|, the client may show a promotion for the data reduction
+  // proxy.
   //
   // A standard configuration has a primary proxy, and a fallback proxy for
   // HTTP traffic. The alternative configuration has a different primary and
@@ -119,6 +119,11 @@ class DataReductionProxyParams {
     return probe_url_;
   }
 
+  // Returns the URL to fetch to warm the data reduction proxy connection.
+  const GURL& warmup_url() const {
+    return warmup_url_;
+  }
+
   // Set the proxy authentication key.
   void set_key(const std::string& key) {
     key_ = key;
@@ -180,6 +185,7 @@ class DataReductionProxyParams {
   virtual std::string GetDefaultAltOrigin() const;
   virtual std::string GetDefaultAltFallbackOrigin() const;
   virtual std::string GetDefaultProbeURL() const;
+  virtual std::string GetDefaultWarmupURL() const;
 
  private:
   GURL origin_;
@@ -188,6 +194,7 @@ class DataReductionProxyParams {
   GURL alt_origin_;
   GURL alt_fallback_origin_;
   GURL probe_url_;
+  GURL warmup_url_;
 
   std::string key_;
 
@@ -196,7 +203,6 @@ class DataReductionProxyParams {
   bool alt_allowed_;
   const bool promo_allowed_;
 
-
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyParams);
 };