"Top Document Isolation" mode

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1500 matching lines @@
     switches::kProfilerTiming,
     switches::kReducedReferrerGranularity,
     switches::kReduceSecurityForTesting,
     switches::kRegisterPepperPlugins,
     switches::kRendererStartupDialog,
     switches::kRootLayerScrolls,
     switches::kShowPaintRects,
     switches::kSitePerProcess,
     switches::kStatsCollectionController,
     switches::kTestType,
+    switches::kTopDocumentIsolation,

[Charlie Reis, 2016/03/25 19:47:13]

Ah yes.  I was wondering why we need this in the renderer process, but it
affects AreCrossProcessFramesPossible, which gets called there.

[ncarter (slow), 2016/03/28 22:00:29]

Exactly right. Hilarious things happen if you forget this, especially around the
renderer process and browser process seeing different results for
SiteIsolationPolicy::UseSubframeNavigationEntries().

     switches::kTouchEvents,
     switches::kTouchTextSelectionStrategy,
     switches::kTraceConfigFile,
     switches::kTraceToConsole,
     switches::kUseCrossProcessFramesForGuests,
     switches::kUseFakeUIForMediaStream,
     // This flag needs to be propagated to the renderer process for
     // --in-process-webgl.
     switches::kUseGL,
     switches::kUseMobileUserAgent,
@@ skipping 1288 matching lines @@
 
     // Skip widgets in other processes.
     if (rvh->GetProcess()->GetID() != GetID())
       continue;
 
     rvh->OnWebkitPreferencesChanged();
   }
 }
 
 }  // namespace content