Control ES2015 'Tail call elimination' language feature via finch flag.

content/test/test_blink_web_unit_test_support.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/test/test_blink_web_unit_test_support.h"
 
+#include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
@@ skipping 75 matching lines @@
   base::mac::ScopedNSAutoreleasePool autorelease_pool;
 #endif
 
   url_loader_factory_.reset(new WebURLLoaderMockFactory());
   mock_clipboard_.reset(new MockWebClipboardImpl());
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   gin::V8Initializer::LoadV8Snapshot();
   gin::V8Initializer::LoadV8Natives();
 #endif
+  // Set up a FeatureList instance, so that code using that API will not hit
+  // an error that it's not set. Cleared by ClearInstanceForTesting() below.
+  base::FeatureList::SetInstance(make_scoped_ptr(new base::FeatureList));
 
   scoped_refptr<base::SingleThreadTaskRunner> dummy_task_runner;
   scoped_ptr<base::ThreadTaskRunnerHandle> dummy_task_runner_handle;
   if (!base::ThreadTaskRunnerHandle::IsSet()) {
     // Dummy task runner is initialized here because the blink::initialize
     // creates IsolateHolder which needs the current task runner handle. There
     // should be no task posted to this task runner. The message loop is not
     // created before this initialization because some tests need specific kinds
     // of message loops, and their types are not known upfront. Some tests also
     // create their own thread bundles or message loops, and doing the same in
@@ skipping 38 matching lines @@
   std::string flags("--expose-gc");
   v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
 }
 
 TestBlinkWebUnitTestSupport::~TestBlinkWebUnitTestSupport() {
   url_loader_factory_.reset();
   mock_clipboard_.reset();
   if (renderer_scheduler_)
     renderer_scheduler_->Shutdown();
   blink::shutdown();
+
+  // Clear the FeatureList that was registered above.
+  base::FeatureList::ClearInstanceForTesting();
 }
 
 blink::WebBlobRegistry* TestBlinkWebUnitTestSupport::blobRegistry() {
   return &blob_registry_;
 }
 
 blink::WebClipboard* TestBlinkWebUnitTestSupport::clipboard() {
   // Mock out clipboard calls so that tests don't mess
   // with each other's copies/pastes when running in parallel.
   return mock_clipboard_.get();
@@ skipping 174 matching lines @@
   return BlinkPlatformImpl::currentThread();
 }
 
 void TestBlinkWebUnitTestSupport::getPluginList(
     bool refresh, blink::WebPluginListBuilder* builder) {
   builder->addPlugin("pdf", "pdf", "pdf-files");
   builder->addMediaTypeToLastPlugin("application/pdf", "pdf");
 }
 
 }  // namespace content