Added QuicAllowed policy. Added unit and browser tests.

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index d5b948c61cb33fad32fbae74391769bb5c6c4d8c..e7075725f876786e79a995a28d51d9654b4df680 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -319,19 +319,22 @@ class IOThread : public content::BrowserThreadDelegate {
       const base::CommandLine& command_line,
       base::StringPiece quic_trial_group,
       const VariationParameters& quic_trial_params,
+      bool quic_allowed_by_policy,
       Globals* globals);
 
   // Returns true if QUIC should be enabled, either as a result
   // of a field trial or a command line flag.
   static bool ShouldEnableQuic(
       const base::CommandLine& command_line,
-      base::StringPiece quic_trial_group);
+      base::StringPiece quic_trial_group,
+      bool quic_allowed_by_policy);
 
   // Returns true if QUIC should be enabled for proxies, either as a result
   // of a field trial or a command line flag.
   static bool ShouldEnableQuicForProxies(
       const base::CommandLine& command_line,
-      base::StringPiece quic_trial_group);
+      base::StringPiece quic_trial_group,
+      bool quic_allowed_by_policy);
 
   // Returns true if the selection of the ephemeral port in bind() should be
   // performed by Chromium, and false if the OS should select the port.  The OS
@@ -474,6 +477,9 @@ class IOThread : public content::BrowserThreadDelegate {
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
+  // True if QUIC is allowed by policy.
+  bool is_quic_allowed_by_policy_;
+
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;