Enable features API for content shell and webview

chromecast/browser/cast_browser_main_parts.cc

 // 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.
 
 #include "chromecast/browser/cast_browser_main_parts.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include <string>
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
 #include "chromecast/base/cast_constants.h"
 #include "chromecast/base/cast_paths.h"
@@ skipping 265 matching lines @@
   // rendering if the font cache has to be regenerated for some reason. Doing it
   // explicitly here helps in cases where the browser process is starting up in
   // the background (resources have not yet been granted to cast) since it
   // prevents the long delay the user would have seen on first rendering. Note
   // that future calls to FcInit() are safe no-ops per the FontConfig interface.
   FcInit();
 #endif
 }
 
 int CastBrowserMainParts::PreCreateThreads() {
+  // The only case GetInstance() returns null should be when you are running a
+  // C++ test, in which case currently we do not support command line features.
+  // This allows Test::SetUp() to enable/disable features as necessary. See
+  // crbug.com/596021 for more details.
+  if (!base::FeatureList::GetInstance()) {
+    base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+    scoped_ptr<base::FeatureList> feature_list(new base::FeatureList);
+    feature_list->InitializeFromCommandLine(
+        command_line->GetSwitchValueASCII(switches::kEnableFeatures),
+        command_line->GetSwitchValueASCII(switches::kDisableFeatures));
+    base::FeatureList::SetInstance(std::move(feature_list));
+  }
+
 #if defined(OS_ANDROID)
   // GPU process is started immediately after threads are created, requiring
   // CrashDumpManager to be initialized beforehand.
   base::FilePath crash_dumps_dir;
   if (!chromecast::CrashHandler::GetCrashDumpLocation(&crash_dumps_dir)) {
     LOG(ERROR) << "Could not find crash dump location.";
   }
   cast_browser_process_->SetCrashDumpManager(
       make_scoped_ptr(new breakpad::CrashDumpManager(crash_dumps_dir)));
 #else
@@ skipping 139 matching lines @@
 #if defined(USE_AURA)
   aura::Env::DeleteInstance();
 #endif
 
   DeregisterKillOnAlarm();
 #endif
 }
 
 }  // namespace shell
 }  // namespace chromecast