Add an about:flag to support alternative data saver features

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 1144 matching lines @@
     "Slow connections only";
 
 const char kEnableDataReductionProxyLitePageName[] =
     "Lite pages for Data Saver Lo-Fi mode";
 
 const char kEnableDataReductionProxyLitePageDescription[] =
     "Enable lite pages in Data Saver Lo-Fi mode. Previews of pages will be "
     "shown instead of image placeholders when Lo-Fi is on. Data Saver and "
     "Lo-Fi must be enabled for lite pages to be shown.";
 
+const char kDataReductionProxyServerAlternative[] =
+    "Use alternative server configuration";

[buettner, 2017/05/23 23:32:13]

Just curious, but why are there three descriptions that say essentially the same
thing using slightly different words?

[RyanSturm, 2017/05/24 16:16:03]

1) what the text in the drop down says
2) What the bold name of the flag is
3) what the text below the name says

I am completely open to suggestions (for instance changing the drop down text to
just "alternative" to match the exp header" or changing the name to something
shorter "Alternative Data Saver back end.")

+
+const char kEnableDataReductionProxyServerExperimentName[] =
+    "Use an alternative Data Saver back end configuration.";
+
+const char kEnableDataReductionProxyServerExperimentDescription[] =
+    "Enable a different approach to saving data by configuring the back end "
+    "server";
+
 const char kDataReductionProxyCarrierTestName[] =
     "Enable a carrier-specific Data Reduction Proxy for testing.";
 
 const char kDataReductionProxyCarrierTestDescription[] =
     "Use a carrier-specific Data Reduction Proxy for testing.";
 
 const char kEnableDataReductionProxySavingsPromoName[] =
     "Data Saver 1 MB Savings Promo";
 
 const char kEnableDataReductionProxySavingsPromoDescription[] =
@@ skipping 1975 matching lines @@
 
 const char kDisableNewVirtualKeyboardBehaviorName[] =
     "New window behavior for the accessibility keyboard";
 const char kDisableNewVirtualKeyboardBehaviorDescription[] =
     "Disable new window behavior for the accessibility keyboard "
     "in non-sticky mode (do not change work area in non-sticky mode).";
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions