blimp: Enable the updated compositing path by default.

blimp/client/core/context/blimp_client_context_impl.cc

 // Copyright 2016 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/client/core/context/blimp_client_context_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 121 matching lines @@
   settings_feature_->PushSettings();
 
   connection_status_.AddObserver(this);
 
   // Initialize must only be posted after the features have been
   // registered.
   io_thread_task_runner_->PostTask(
       FROM_HERE, base::Bind(&ClientNetworkComponents::Initialize,
                             base::Unretained(net_components_.get())));
 
+  // Enable the updated compositing path before any tabs are created.
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(

[David Trainor- moved to gerrit, 2016/11/04 04:23:54]

Might be nice to have a function like the one for the engine.  A place where we
can put all blimp-specific command line defaults.

[Khushal, 2016/11/04 04:26:48]

That's a cool idea. Is there a better place to do this? Otherwise I can put it
in a function here in the .cc file itself.

+      switches::kEnableUpdatedCompositingPath);
+
   UMA_HISTOGRAM_BOOLEAN("Blimp.Supported", true);
 }
 
 BlimpClientContextImpl::~BlimpClientContextImpl() {
   io_thread_task_runner_->DeleteSoon(FROM_HERE, net_components_.release());
   connection_status_.RemoveObserver(this);
 }
 
 void BlimpClientContextImpl::SetDelegate(BlimpClientContextDelegate* delegate) {
   delegate_ = delegate;
@@ skipping 117 matching lines @@
     if (result >= 0) {
       delegate_->OnEngineDisconnected(result);
     } else {
       delegate_->OnNetworkDisconnected(result);
     }
   }
 }
 
 }  // namespace client
 }  // namespace blimp