Disable cross-process navigations in --single-process.

content/public/common/content_switches.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 "build/build_config.h"
 #include "content/public/common/content_switches.h"
 #include "media/media_features.h"
 
 namespace switches {
 
@@ skipping 702 matching lines @@
 // - The class comment in site_instance.h, listing the supported process models.
 //
 // IMPORTANT: This isn't to be confused with --site-per-process (which is about
 // isolation, not consolidation). You probably want the other one.
 const char kProcessPerSite[]                = "process-per-site";
 
 // Runs each set of script-connected tabs (i.e., a BrowsingInstance) in its own
 // renderer process.  We default to using a renderer process for each
 // site instance (i.e., group of pages from the same registered domain with
 // script connections to each other).
+// TODO(creis): This flag is currently a no-op.  We should refactor it to avoid
+// "unnecessary" process swaps for cross-site navigations but still swap when
+// needed for security (e.g., isolated origins).
 const char kProcessPerTab[]                 = "process-per-tab";
 
 // The value of this switch determines whether the process is started as a
 // renderer or plugin host.  If it's empty, it's the browser.
 const char kProcessType[]                   = "type";
 
 // Uses a specified proxy server, overrides system settings. This switch only
 // affects HTTP and HTTPS requests. ARC-apps use only HTTP proxy server with the
 // highest priority.
 // TODO(yzshen): Move this switch back to chrome/common/chrome_switches.{h,cc},
@@ skipping 340 matching lines @@
 // The flag tells the sandbox initialization code inside Chrome that the sandbox
 // should already be enabled.
 // TODO(kerrnel): Remove this once the V2 sandbox migration is complete, as
 // processes will be assumed to run under the V2 sandbox.
 const char kV2SandboxedEnabled[] = "v2-sandbox-enabled";
 #endif  // defined(OS_MACOSX)
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches