Initial implementation for sharing field trial state (win)

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 367a69d9323fd065203a78416690ba86d09ad846..d2cfa29bdd16736ad42194c516f4eb0151bead33 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -48,6 +48,7 @@
 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
 #include "content/public/common/connection_filter.h"
 #include "content/public/common/content_client.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/mojo_channel_switches.h"
 #include "content/public/common/mojo_shell_connection.h"
@@ -973,8 +974,11 @@ bool GpuProcessHost::LaunchGpuProcess(gpu::GpuPreferences* gpu_preferences) {
 
   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
 #endif
+
   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kGpuProcess);
-  BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(cmd_line);
+
+  field_trial_state_ =
+      BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(cmd_line);
 
 #if defined(OS_WIN)
   cmd_line->AppendArg(switches::kPrefetchArgumentGpu);
@@ -1018,10 +1022,8 @@ bool GpuProcessHost::LaunchGpuProcess(gpu::GpuPreferences* gpu_preferences) {
     cmd_line->PrependWrapper(gpu_launcher);
 
   process_->Launch(
-      new GpuSandboxedProcessLauncherDelegate(cmd_line,
-                                              process_->GetHost()),
-      cmd_line,
-      true);
+      new GpuSandboxedProcessLauncherDelegate(cmd_line, process_->GetHost()),
+      cmd_line, field_trial_state_.get(), true);
   process_launched_ = true;
 
   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",