Use FrameIsAd to decide whether to isolate a frame in TopDocumentIsolation mode.

content/public/common/content_features.cc

 // Copyright 2015 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 "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
@@ skipping 254 matching lines @@
 // (https://www.ietf.org/id/draft-ietf-tokbind-protocol-04.txt).
 const base::Feature kTokenBinding{"token-binding",
                                   base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Groups all out-of-process iframes to a different process from the process of
 // the top document. This is a performance isolation mode.  Launch bug:
 // https://crbug.com/595987.
 const base::Feature kTopDocumentIsolation{"top-document-isolation",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Finch Experiment Param (see base::GetFieldTrialParamValueByFeature)

[Alexei Svitkine (slow), 2017/07/07 16:55:05]

In source code, we don't usually use the term "Finch". You can use Variation
param or Field trial param.

[Łukasz Anforowicz, 2017/07/07 20:41:42]

Done.

+// controlling the mode for selecting which subframes end in the TDI process.
+// Valid values are integers from the TopDocumentIsolationMode enum.
+const char kTopDocumentIsolationModeParam[] = "mode";
+
 // Enables touchpad and wheel scroll latching.
 const base::Feature kTouchpadAndWheelScrollLatching{
     "TouchpadAndWheelScrollLatching", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Use Feature Policy to gate the use of permission features like midi,
 // geolocation, camera, microphone, etc.
 const base::Feature kUseFeaturePolicyForPermissions{
     "UseFeaturePolicyForPermissions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Use MojoAudioOutputIPC and RenderFrameAudioOutputStreamFactory rather than
@@ skipping 114 matching lines @@
 #endif
 
 #if defined(OS_MACOSX)
 // The V2 sandbox on MacOS removes the unsandboed warmup phase and sandboxes the
 // entire life of the process.
 const base::Feature kMacV2Sandbox{"MacV2Sandbox",
                                   base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_MACOSX)
 
 }  // namespace features