Run the WebGL conformance tests with the passthrough command decoder.

content/browser/gpu/gpu_process_host.cc

 // Copyright (c) 2012 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 "content/browser/gpu/gpu_process_host.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 144 matching lines @@
 #endif
 #if defined(USE_OZONE)
     switches::kOzonePlatform,
 #endif
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
     switches::kX11Display,
 #endif
     switches::kGpuTestingGLVendor,
     switches::kGpuTestingGLRenderer,
     switches::kGpuTestingGLVersion,
-    switches::kDisableGpuDriverBugWorkarounds};
+    switches::kDisableGpuDriverBugWorkarounds,
+    switches::kUsePassthroughCmdDecoder};
 
 enum GPUProcessLifetimeEvent {
   LAUNCHED,
   DIED_FIRST_TIME,
   DIED_SECOND_TIME,
   DIED_THIRD_TIME,
   DIED_FOURTH_TIME,
   GPU_PROCESS_LIFETIME_EVENT_MAX = 100
 };
 
@@ skipping 1015 matching lines @@
   TRACE_EVENT0("gpu", "GpuProcessHost::OnCacheShader");
   ClientIdToShaderCacheMap::iterator iter =
       client_id_to_shader_cache_.find(client_id);
   // If the cache doesn't exist then this is an off the record profile.
   if (iter == client_id_to_shader_cache_.end())
     return;
   iter->second->Cache(GetShaderPrefixKey() + ":" + key, shader);
 }
 
 }  // namespace content