Initial implementation for sharing field trial state (win)

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 955 matching lines @@
 #else
   int child_flags = ChildProcessHost::CHILD_NORMAL;
 #endif
 
   base::FilePath exe_path = ChildProcessHost::GetChildPath(child_flags);
   if (exe_path.empty())
     return false;
 
   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
 #endif
+
   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kGpuProcess);
+
+#if defined(OS_WIN)
+  field_trial_state_.reset(new base::SharedMemory());
+  BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(
+    cmd_line, field_trial_state_.get());
+#else
   BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(cmd_line);
+#endif
 
 #if defined(OS_WIN)
   cmd_line->AppendArg(switches::kPrefetchArgumentGpu);
 #endif  // defined(OS_WIN)
 
   if (kind_ == GPU_PROCESS_KIND_UNSANDBOXED)
     cmd_line->AppendSwitch(switches::kDisableGpuSandbox);
 
   // TODO(penghuang): Replace all GPU related switches with GpuPreferences.
   // https://crbug.com/590825
@@ skipping 25 matching lines @@
   UMA_HISTOGRAM_BOOLEAN("GPU.GPUProcessSoftwareRendering",
                         swiftshader_rendering_);
 
   // If specified, prepend a launcher program to the command line.
   if (!gpu_launcher.empty())
     cmd_line->PrependWrapper(gpu_launcher);
 
   process_->Launch(
       new GpuSandboxedProcessLauncherDelegate(cmd_line,
                                               process_->GetHost()),
+  #if defined(OS_WIN)
+      field_trial_state_.get()->handle().GetHandle(),
+  #endif
       cmd_line,
       true);
   process_launched_ = true;
 
   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",
                             LAUNCHED, GPU_PROCESS_LIFETIME_EVENT_MAX);
   return true;
 }
 
 void GpuProcessHost::SendOutstandingReplies() {
@@ skipping 134 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