Add Click to Open PDF Placeholder feature

chrome/common/chrome_features.cc

 // Copyright 2016 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/common/chrome_features.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
@@ skipping 92 matching lines @@
 
 // Whether to capture page thumbnails when the page load finishes (in addition
 // to any other times this might happen).
 const base::Feature kCaptureThumbnailOnLoadFinished{
     "CaptureThumbnailOnLoadFinished", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Whether to trigger app banner installability checks on page load.
 const base::Feature kCheckInstallabilityForBannerOnLoad{
     "CheckInstallabilityForBannerOnLoad", base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kClickToOpenPDFPlaceholder{
+    "ClickToOpenPDFPlaceholder", base::FEATURE_DISABLED_BY_DEFAULT};
+
 #if defined(OS_ANDROID)
 // Experiment to make Geolocation permissions in the omnibox and the default
 // search engine's search page consistent.
 const base::Feature kConsistentOmniboxGeolocation{
     "ConsistentOmniboxGeolocation", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 #if defined(OS_ANDROID)
 // Experiment to extract structured metadata for app indexing.
 const base::Feature kCopylessPaste{"CopylessPaste",
@@ skipping 271 matching lines @@
   return base::FeatureList::IsEnabled(features::kPrefService) ||
 #if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
          base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
              switches::kMusConfig) == switches::kMash;
 #else
          false;
 #endif
 }
 
 }  // namespace features