Snackbar for promoting Data Saver to existing users

chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.cc

 // 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.
 
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.h"
 
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 98 matching lines @@
       data_reduction_proxy::kNumDaysInHistorySummary,
       &original_content_length,
       &received_content_length,
       &last_update_internal);
 
   return Java_ContentLengths_create(env,
                                     original_content_length,
                                     received_content_length);
 }
 
+jlong DataReductionProxySettingsAndroid::GetTotalHttpContentLengthSaved(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  return Settings()->GetHttpOriginalContentLength() -

[tbansal1, 2016/10/25 18:10:04]

If only saved bytes are needed, then is it possible to just expose that from
settings?

[megjablon, 2016/10/25 22:14:19]

I implemented it this way so it was clear what content length saved meant.
Changed so this is passed from settings though. 

+         Settings()->GetHttpReceivedContentLength();
+}
+
 ScopedJavaLocalRef<jlongArray>
 DataReductionProxySettingsAndroid::GetDailyOriginalContentLengths(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
   return GetDailyContentLengths(
       env, data_reduction_proxy::prefs::kDailyHttpOriginalContentLength);
 }
 
 ScopedJavaLocalRef<jlongArray>
 DataReductionProxySettingsAndroid::GetDailyReceivedContentLengths(
@@ skipping 68 matching lines @@
   if (!event_store)
     return ConvertUTF8ToJavaString(env, std::string());
 
   return ConvertUTF8ToJavaString(env, event_store->SanitizedLastBypassEvent());
 }
 
 // Used by generated jni code.
 static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   return reinterpret_cast<intptr_t>(new DataReductionProxySettingsAndroid());
 }