Make content shell support some testing flags.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 9e3e3a83a76ecd6ed4c2d3872d52dfd085489795..865567666e83d88932c39f1e81d9f918b64d4fe9 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -435,6 +435,9 @@ const char kGpuVendorID[]                   = "gpu-vendor-id";
 // to run as a guest renderer instead of a regular renderer.
 const char kGuestRenderer[]                 = "guest-renderer";
 
+// These mappings only apply to the host resolver.
+const char kHostResolverRules[]             = "host-resolver-rules";
+
 // Ignores GPU blacklist.
 const char kIgnoreGpuBlacklist[]            = "ignore-gpu-blacklist";
 
@@ -587,6 +590,10 @@ const char kTapDownDeferralTimeMs[]         = "tap-down-deferral-time";
 // Runs the security test for the renderer sandbox.
 const char kTestSandbox[]                   = "test-sandbox";
 
+// Allows for forcing socket connections to http/https to use fixed ports.
+const char kTestingFixedHttpPort[]          = "testing-fixed-http-port";
+const char kTestingFixedHttpsPort[]         = "testing-fixed-https-port";
+
 // Causes TRACE_EVENT flags to be recorded from startup. Optionally, can
 // specify the specific trace categories to include (e.g.
 // --trace-startup=base,net) otherwise, all events are recorded. Setting this