Enable FeatureList for the GPU process.

content/browser/browser_child_process_host_impl.cc

Index: content/browser/browser_child_process_host_impl.cc
diff --git a/content/browser/browser_child_process_host_impl.cc b/content/browser/browser_child_process_host_impl.cc
index 4a2dd39ae2aa357bd2f3664b4e1320470d6c8123..ff59df4c22d71d00702d22d4628c607b1f734b14 100644
--- a/content/browser/browser_child_process_host_impl.cc
+++ b/content/browser/browser_child_process_host_impl.cc
@@ -8,10 +8,12 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/dump_without_crashing.h"
+#include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
@@ -176,6 +178,28 @@ void BrowserChildProcessHostImpl::TerminateAll() {
   }
 }
 
+// static
+void BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(
+    base::CommandLine* cmd_line) {
+  std::string enabled_features;
+  std::string disabled_features;
+  base::FeatureList::GetInstance()->GetFeatureOverrides(&enabled_features,
+                                                        &disabled_features);
+  if (!enabled_features.empty())
+    cmd_line->AppendSwitchASCII(switches::kEnableFeatures, enabled_features);
+  if (!disabled_features.empty())
+    cmd_line->AppendSwitchASCII(switches::kDisableFeatures, disabled_features);
+
+  // If we run base::FieldTrials, we want to pass to their state to the
+  // child process so that it can act in accordance with each state.
+  std::string field_trial_states;
+  base::FieldTrialList::AllStatesToString(&field_trial_states);
+  if (!field_trial_states.empty()) {
+    cmd_line->AppendSwitchASCII(switches::kForceFieldTrials,
+                                field_trial_states);
+  }
+}
+
 void BrowserChildProcessHostImpl::Launch(
     SandboxedProcessLauncherDelegate* delegate,
     base::CommandLine* cmd_line,