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)},
     {"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 518 matching lines @@
   // builds and the Canary/Dev channel.
   if (!strcmp("enable-data-reduction-proxy-carrier-test",
               entry.internal_name) &&
       channel != version_info::Channel::DEV &&
       channel != version_info::Channel::CANARY &&
       channel != version_info::Channel::UNKNOWN) {
     return true;
   }
 #endif
 
-  // data-reduction-proxy-lo-fi is only available for Chromium builds and
-  // the Canary/Dev/Beta channels.
-  if (!strcmp("data-reduction-proxy-lo-fi", entry.internal_name) &&
+  // data-reduction-proxy-lo-fi and enable-data-reduction-proxy-lo-fi-preview
+  // are only available for Chromium builds and the Canary/Dev/Beta channels.
+  if ((!strcmp("data-reduction-proxy-lo-fi", entry.internal_name) ||
+       !strcmp("enable-data-reduction-proxy-lo-fi-preview",
+               entry.internal_name)) &&
       channel != version_info::Channel::BETA &&
       channel != version_info::Channel::DEV &&
       channel != version_info::Channel::CANARY &&
       channel != version_info::Channel::UNKNOWN) {
     return true;
   }
 
   // enable-data-reduction-proxy-config-client is only available for Chromium
   // builds and the Canary/Dev channels.
   if (!strcmp("enable-data-reduction-proxy-config-client",
@@ skipping 577 matching lines @@
   FlagsState::GetInstance()->SetFeatureEntries(entries, count);
 }
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   return FlagsState::GetInstance()->GetFeatureEntries(count);
 }
 
 }  // namespace testing
 
 }  // namespace about_flags