Make SDCH dictionaries persistent across browser restart.

chrome/browser/net/sdch_browsertest.cc

 // Copyright 2014 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.
 
 // End-to-end SDCH tests.  Uses the embedded test server to return SDCH
 // results
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 199 matching lines @@
         response->set_content(kSampleData);
         if (ClientIsAdvertisingSdchEncoding(request.headers))
           response->AddCustomHeader("Get-Dictionary", kDictionaryURLPath);
         // We never cache the plain data response, to make it
         // easy to refresh after we get the dictionary.
         response->AddCustomHeader("Cache-Control", "no-store");
       }
     } else {
       DCHECK_EQ(request.relative_url, kDictionaryURLPath);
       DCHECK_NE(sdch_dictionary_contents_, "");
+      response->AddCustomHeader("Cache-Control", "max-age=3600");
       response->set_content_type("application/x-sdch-dictionary");
       response->set_content(sdch_dictionary_contents_);
     }
     std::vector<base::Closure> callbacks;
     callbacks.swap(callback_vector_);
     for (std::vector<base::Closure>::iterator it = callbacks.begin();
          it != callbacks.end(); ++it) {
       it->Run();
     }
     return response.Pass();
@@ skipping 464 matching lines @@
   ASSERT_TRUE(SetupIncognitoBrowser());
   ASSERT_TRUE(ForceSdchDictionaryLoad(incognito_browser()));
 
   // Data fetches on main browser should not be SDCH encoded.
   bool sdch_encoding_used = true;
   ASSERT_TRUE(GetData(&sdch_encoding_used));
   EXPECT_FALSE(sdch_encoding_used);
 }
 
 }  // namespace