Centralize the Data Reduction Proxy pass through header

chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.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_NET_SPDYPROXY_DATA_REDUCTION_PROXY_SETTINGS_ANDROID_H_
 #define CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_SETTINGS_ANDROID_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 56 matching lines @@
       const base::android::JavaParamRef<jobject>& obj);
   jlong GetTotalHttpContentLengthSaved(
         JNIEnv* env,
         const base::android::JavaParamRef<jobject>& obj);
   ScopedJavaLocalRef<jlongArray> GetDailyOriginalContentLengths(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   ScopedJavaLocalRef<jlongArray> GetDailyReceivedContentLengths(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
+  ScopedJavaLocalRef<jstring> GetDataReductionProxyPassThroughHeader(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
 
   // Return a Java |ContentLengths| object wrapping the results of a call to
   // DataReductionProxySettings::GetContentLengths.
   base::android::ScopedJavaLocalRef<jobject> GetContentLengths(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
 
   // Determines whether the data reduction proxy is unreachable. This is
   // done by keeping a count of requests which go through proxy vs those
   // which should have gone through the proxy based on the config.
@@ skipping 53 matching lines @@
                                                         const char* pref_name);
 
   virtual data_reduction_proxy::DataReductionProxySettings* Settings();
 
   base::WeakPtrFactory<DataReductionProxySettingsAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxySettingsAndroid);
 };
 
 #endif  // CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_SETTINGS_ANDROID_H_