Register a fake Flash with chrome://plugins during browser start-up.

chrome/common/chrome_content_client.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/common/chrome_content_client.h"
 
 #include <stdint.h>
 
+#include <map>

[Will Harris, 2016/08/26 22:52:35]

unneeded?

[waffles, 2016/08/26 23:10:04]

Same deal, used on 501, decided to include it while I was here. Happy to revert
this change.

 #include <memory>
 #include <tuple>
 
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/scoped_vector.h"
 #include "base/native_library.h"
@@ skipping 525 matching lines @@
 #endif  // defined(OS_CHROMEOS)
 
   std::unique_ptr<content::PepperPluginInfo> system_flash(
       new content::PepperPluginInfo);
   if (GetSystemPepperFlash(system_flash.get()))
     flash_versions.push_back(system_flash.release());
 
   // This function will return only the most recent version of the flash plugin.
   content::PepperPluginInfo* max_flash =
       FindMostRecentPlugin(flash_versions.get());
-  if (max_flash)
+  if (max_flash) {
     plugins->push_back(*max_flash);
+  } else {
+#if defined(GOOGLE_CHROME_BUILD) && defined(FLAPPER_AVAILABLE)
+    // Add a fake Flash plugin even though it doesn't actually exist - if a
+    // web page requests it, it will be component-updated on-demand. There is
+    // nothing that guarantees the component update will give us the
+    // FLAPPER_VERSION_STRING version of Flash, but using this version seems
+    // better than any other hardcoded alternative.
+    plugins->push_back(CreatePepperFlashInfo(
+        base::FilePath::FromUTF8Unsafe(ChromeContentClient::kNotPresent),
+        FLAPPER_VERSION_STRING, false, false, true));
+#endif  // defined(GOOGLE_CHROME_BUILD) && defined(FLAPPER_AVAILABLE)
+  }
 #endif  // defined(ENABLE_PLUGINS)
 }
 
 void ChromeContentClient::AddContentDecryptionModules(
     std::vector<content::CdmInfo>* cdms) {
 // TODO(jrummell): Need to have a better flag to indicate systems Widevine
 // is available on. For now we continue to use ENABLE_PEPPER_CDMS so that
 // we can experiment between pepper and mojo.
 #if defined(WIDEVINE_CDM_AVAILABLE_NOT_COMPONENT)
   base::FilePath adapter_path;
@@ skipping 151 matching lines @@
     origin_trial_policy_ = base::WrapUnique(new ChromeOriginTrialPolicy());
   }
   return origin_trial_policy_.get();
 }
 
 #if defined(OS_ANDROID)
 media::MediaClientAndroid* ChromeContentClient::GetMediaClientAndroid() {
   return new ChromeMediaClientAndroid();
 }
 #endif  // OS_ANDROID