Add "q=preview" directive on main frame requests on poor networks

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1765 matching lines @@
      IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
      IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION,
      kOsCrOS,
      SINGLE_VALUE_TYPE(chromeos::switches::kDisableTimeZoneTrackingOption)},
 #endif  // defined(OS_CHROMEOS)
     {"data-reduction-proxy-lo-fi",
      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_NAME,
      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_DESCRIPTION,
      kOsAll,
      MULTI_VALUE_TYPE(kDataReductionProxyLoFiChoices)},
+    {"enable-data-reduction-proxy-lo-fi-preview",
+     IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_LO_FI_PREVIEW_NAME,
+     IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_LO_FI_PREVIEW_DESCRIPTION,
+     kOsAll,
+     SINGLE_VALUE_TYPE(
+         data_reduction_proxy::switches::kEnableDataReductionProxyLoFiPreview)},

[Alexei Svitkine (slow), 2015/11/24 18:57:06]

Given this is a new flag, I suggest using the base/feature_list.h API for this
instead.

See announcement here:

https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/Esavy4-JTHY

[megjablon, 2015/11/24 19:38:11]

For organization purposes, I'd like to the keep the switch the way it is now.
This is layered on top of the lo-fi switch, and it is confusing to enable the
two switches in different ways. Also, this feature does not need a disable
switch.

     {"clear-data-reduction-proxy-data-savings",
      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_NAME,
      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_DESCRIPTION,
      kOsAll,
      SINGLE_VALUE_TYPE(
          data_reduction_proxy::switches::kClearDataReductionProxyDataSavings)},
     {"enable-data-reduction-proxy-config-client",
      IDS_FLAGS_DATA_REDUCTION_PROXY_CONFIG_CLIENT_NAME,
      IDS_FLAGS_DATA_REDUCTION_PROXY_CONFIG_CLIENT_DESCRIPTION,
      kOsAll,
@@ skipping 1118 matching lines @@
   FlagsState::GetInstance()->SetFeatureEntries(entries, count);
 }
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   return FlagsState::GetInstance()->GetFeatureEntries(count);
 }
 
 }  // namespace testing
 
 }  // namespace about_flags