blimp: Enable the updated compositing path by default.

blimp/engine/app/blimp_engine_config.cc

 // Copyright 2015 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 "blimp/engine/app/blimp_engine_config.h"
 
 #include <memory>
 #include <string>
 
 #include "base/base_switches.h"
@@ skipping 23 matching lines @@
       ::switches::kUseGL,
       "osmesa");  // Avoid invoking gpu::CollectDriverVersionNVidia.
 
   // Disable threaded animation since we don't support them right now.
   // (crbug/570376).
   command_line->AppendSwitch(cc::switches::kDisableThreadedAnimation);
 
   // Disable use-zoom-for-dsf since it ends up overriding the device scale
   // factor reported to the client. See crbug.com/654898.
   command_line->AppendSwitchASCII(::switches::kEnableUseZoomForDSF, "false");
+
+  // Enable the updated compositing path.
+  command_line->AppendSwitch(::switches::kUseLayerTreeHostRemote);
 }
 
 BlimpEngineConfig::~BlimpEngineConfig() {}
 
 // static
 std::unique_ptr<BlimpEngineConfig> BlimpEngineConfig::Create(
     const base::CommandLine& cmd_line) {
   const std::string client_auth_token = GetClientAuthToken(cmd_line);
   if (!client_auth_token.empty()) {
     return base::WrapUnique(new BlimpEngineConfig(client_auth_token));
   }
   return nullptr;
 }
 
 // static
 std::unique_ptr<BlimpEngineConfig> BlimpEngineConfig::CreateForTest(
     const std::string& client_auth_token) {
   return base::WrapUnique(new BlimpEngineConfig(client_auth_token));
 }
 
 const std::string& BlimpEngineConfig::client_auth_token() const {
   return client_auth_token_;
 }
 
 BlimpEngineConfig::BlimpEngineConfig(const std::string& client_auth_token)
     : client_auth_token_(client_auth_token) {}
 
 }  // namespace engine
 }  // namespace blimp