Create a Lite Page bit for previews and fallback to Lo-Fi

components/data_reduction_proxy/core/common/data_reduction_proxy_params.h

 // 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.
 
 #ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_REDUCTION_PROXY_PARAMS_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_REDUCTION_PROXY_PARAMS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 34 matching lines @@
 // SPDY/HTTP2 proxy field trial.
 bool IsIncludedInTrustedSpdyProxyFieldTrial();
 
 // Returns true if this client is part of the field trial that should display
 // a promotion for the data reduction proxy on Android One devices.
 bool IsIncludedInAndroidOnePromoFieldTrial(base::StringPiece build_fingerprint);
 
 // Returns the name of the Lo-Fi field trial.
 const char* GetLoFiFieldTrialName();
 
+// Returns the name of the Lite Page fallback to Lo-Fi field trial.
+const char* GetLitePageFallbackFieldTrialName();
+
 // Returns the name of the Lo-Fi field trial that configures LoFi flags when it
 // is force enabled through flags.
 const char* GetLoFiFlagFieldTrialName();
 
 // Returns true if this client is part of the "Enabled" or "Enabled_Preview"
 // group of the Lo-Fi field trial, both of which mean Lo-Fi should be enabled.
 bool IsIncludedInLoFiEnabledFieldTrial();
 
 // Returns true if this client is part of the "Control" group of the Lo-Fi field
 // trial.
 bool IsIncludedInLoFiControlFieldTrial();
 
 // Returns true if this client is part of the "Preview" group of the Lo-Fi field
 // trial.
 bool IsIncludedInLitePageFieldTrial();
 
+// Returns true if this client is part of the Lite Page fallback to Lo-Fi field
+// trial or if this client has the command line switch to enable lite pages,
+// which should always fallback.
+bool IsLitePageFallbackEnabled();
+
 // Returns true if this client is part of the field trial that should enable
 // server experiments for the data reduction proxy.
 bool IsIncludedInServerExperimentsFieldTrial();
 
 // Returns true if this client is part of the tamper detection experiment.
 bool IsIncludedInTamperDetectionExperiment();
 
 // Returns true if this client has any of the values to enable Lo-Fi mode for
 // the "data-reduction-proxy-lo-fi" command line switch. This includes the
 // "always-on", "cellular-only", and "slow-connections-only" values.
@@ skipping 10 matching lines @@
 // Returns true if this client has the command line switch to enable Lo-Fi
 // mode only on slow connections.
 bool IsLoFiSlowConnectionsOnlyViaFlags();
 
 // Returns true if this client has the command line switch to disable Lo-Fi
 // mode.
 bool IsLoFiDisabledViaFlags();
 
 // Returns true if this client has the command line switch to enable lite pages.
 // This means a preview should be requested instead of placeholders whenever
-// Lo-Fi mode is on.
+// Lo-Fi mode is on. If Lite Pages are enabled via flags, they will always
+// fallback to Lo-Fi placeholders.
 bool AreLitePagesEnabledViaFlags();
 
 // Returns true if this client has the command line switch to enable forced
 // pageload metrics pingbacks on every page load.
 bool IsForcePingbackEnabledViaFlags();
 
 // Returns true if this client has the command line switch to show
 // interstitials for data reduction proxy bypasses.
 bool WarnIfNoDataReductionProxy();
 
@@ skipping 127 matching lines @@
 
   bool use_override_proxies_for_http_;
   std::vector<DataReductionProxyServer> override_data_reduction_proxy_servers_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyParams);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_COMMON_DATA_REDUCTION_PROXY_PARAMS_H_