Add more options to data-reduction-proxy-experiment

There are now 10 alternative options with description:
  "Use alt. server config" 1..10
which will gives server value of "alt1" .. "alt10"

Bug: 785521
Change-Id: I5fda4acdff28e5ad0bf75e266391757db131f766
Reviewed-on: https://chromium-review.googlesource.com/773283
Commit-Queue: Thanh Le <[email protected]>
Reviewed-by: Tarun Bansal <[email protected]>
Reviewed-by: Ben Greenstein <[email protected]>
Cr-Commit-Position: refs/heads/master@{#518021}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 078876b..8e04d72 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -231,7 +231,16 @@
 extern const char kEnableDataReductionProxyLitePageName[];
 extern const char kEnableDataReductionProxyLitePageDescription[];
 
-extern const char kDataReductionProxyServerAlternative[];
+extern const char kDataReductionProxyServerAlternative1[];
+extern const char kDataReductionProxyServerAlternative2[];
+extern const char kDataReductionProxyServerAlternative3[];
+extern const char kDataReductionProxyServerAlternative4[];
+extern const char kDataReductionProxyServerAlternative5[];
+extern const char kDataReductionProxyServerAlternative6[];
+extern const char kDataReductionProxyServerAlternative7[];
+extern const char kDataReductionProxyServerAlternative8[];
+extern const char kDataReductionProxyServerAlternative9[];
+extern const char kDataReductionProxyServerAlternative10[];
 extern const char kEnableDataReductionProxyServerExperimentName[];
 extern const char kEnableDataReductionProxyServerExperimentDescription[];