Create an in-process v8 proxy resolver using Mojo.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 82c9410cd4a3563db571824175ef32cda8117afd..2383d1eb89e86c67d689942c91023a4beb98fcd5 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1172,6 +1172,9 @@ const char kValidateCrx[]                   = "validate-crx";
 // Uses experimental simple cache backend if possible.
 const char kUseSimpleCacheBackend[]         = "use-simple-cache-backend";
 
+// Enables using an in-process Mojo service for the v8 proxy resolver.
+const char kV8PacMojoInProcess[] = "v8-pac-mojo-in-process";
+
 // Specifies a custom URL for the server which reports variation data to the
 // client. Specifying this switch enables the Variations service on
 // unofficial builds. See variations_service.cc.