Show client placeholders for Server LoFi images.

content/child/runtime_features.cc

 // Copyright 2013 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 "content/child/runtime_features.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/metrics/field_trial.h"
+#include "base/metrics/field_trial_params.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
 #include "content/common/content_switches_internal.h"
 #include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "media/base/media_switches.h"
 #include "services/device/public/cpp/device_features.h"
 #include "third_party/WebKit/public/platform/WebRuntimeFeatures.h"
 #include "ui/gl/gl_switches.h"
@@ skipping 357 matching lines @@
     WebRuntimeFeatures::EnableFeatureFromString("IdleTimeSpellChecking", true);
 
   if (media::GetEffectiveAutoplayPolicy(command_line) !=
       switches::autoplay::kNoUserGestureRequiredPolicy) {
     WebRuntimeFeatures::EnableAutoplayMutedVideos(true);
   }
 
   WebRuntimeFeatures::EnableLocationHardReload(
       base::FeatureList::IsEnabled(features::kLocationHardReload));
 
+  WebRuntimeFeatures::EnableShowClientPlaceholdersForServerLoFi(
+      command_line.HasSwitch(
+          switches::kEnableShowClientPlaceholdersForServerLoFi) ||
+      (!command_line.HasSwitch(
+           switches::kDisableShowClientPlaceholdersForServerLoFi) &&
+       base::GetFieldTrialParamValue("PreviewsClientLoFi",
+                                     "replace_server_placeholders") == "true"));
+
   // Enable explicitly enabled features, and then disable explicitly disabled
   // ones.
   if (command_line.HasSwitch(switches::kEnableBlinkFeatures)) {
     std::vector<std::string> enabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kEnableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : enabled_features)
       WebRuntimeFeatures::EnableFeatureFromString(feature, true);
   }
   if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
     std::vector<std::string> disabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : disabled_features)
       WebRuntimeFeatures::EnableFeatureFromString(feature, false);
   }
 }
 
 }  // namespace content