Enable FeatureList for the GPU process.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <utility>
 #include <vector>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/dump_without_crashing.h"
 #include "base/feature_list.h"
 #include "base/files/file.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/shared_memory_handle.h"
-#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/persistent_histogram_allocator.h"
 #include "base/metrics/persistent_memory_allocator.h"
 #include "base/process/process_handle.h"
 #include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/supports_user_data.h"
@@ skipping 399 matching lines @@
 std::string UintVectorToString(const std::vector<unsigned>& vector) {
   std::string str;
   for (auto it : vector) {
     if (!str.empty())
       str += ",";
     str += base::UintToString(it);
   }
   return str;
 }
 
-// Copies kEnableFeatures and kDisableFeatures to the renderer command line.
-// Generates them from the FeatureList override state, to take into account
-// overrides from FieldTrials.
-void CopyEnableDisableFeatureFlagsToRenderer(base::CommandLine* renderer_cmd) {
-  std::string enabled_features;
-  std::string disabled_features;
-  base::FeatureList::GetInstance()->GetFeatureOverrides(&enabled_features,
-                                                        &disabled_features);
-  if (!enabled_features.empty()) {
-    renderer_cmd->AppendSwitchASCII(switches::kEnableFeatures,
-                                    enabled_features);
-  }
-  if (!disabled_features.empty()) {
-    renderer_cmd->AppendSwitchASCII(switches::kDisableFeatures,
-                                    disabled_features);
-  }
-}
-
 }  // namespace
 
 RendererMainThreadFactoryFunction g_renderer_main_thread_factory = NULL;
 
 base::MessageLoop* g_in_process_thread;
 
 base::MessageLoop*
 RenderProcessHostImpl::GetInProcessRendererThreadForTesting() {
   return g_in_process_thread;
 }
@@ skipping 829 matching lines @@
   // Now send any options from our own command line we want to propagate.
   const base::CommandLine& browser_command_line =
       *base::CommandLine::ForCurrentProcess();
   PropagateBrowserCommandLineToRenderer(browser_command_line, command_line);
 
   // Pass on the browser locale.
   const std::string locale =
       GetContentClient()->browser()->GetApplicationLocale();
   command_line->AppendSwitchASCII(switches::kLang, locale);
 
-  // If we run base::FieldTrials, we want to pass to their state to the
-  // renderer so that it can act in accordance with each state, or record
-  // histograms relating to the base::FieldTrial states.
-  std::string field_trial_states;
-  base::FieldTrialList::AllStatesToString(&field_trial_states);
-  if (!field_trial_states.empty()) {
-    command_line->AppendSwitchASCII(switches::kForceFieldTrials,
-                                    field_trial_states);
-  }
-
   GetContentClient()->browser()->AppendExtraCommandLineSwitches(command_line,
                                                                 GetID());
 
   if (IsPinchToZoomEnabled())
     command_line->AppendSwitch(switches::kEnablePinch);
 
 #if defined(OS_WIN)
   command_line->AppendSwitchASCII(
       switches::kDeviceScaleFactor,
       base::DoubleToString(display::win::GetDPIScale()));
@@ skipping 208 matching lines @@
 #if defined(USE_OZONE)
     switches::kOzonePlatform,
 #endif
 #if defined(OS_CHROMEOS)
     switches::kDisableVaapiAcceleratedVideoEncode,
 #endif
   };
   renderer_cmd->CopySwitchesFrom(browser_cmd, kSwitchNames,
                                  arraysize(kSwitchNames));
 
-  CopyEnableDisableFeatureFlagsToRenderer(renderer_cmd);
+  BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(renderer_cmd);
 
   if (browser_cmd.HasSwitch(switches::kTraceStartup) &&
       BrowserMainLoop::GetInstance()->is_tracing_startup_for_duration()) {
     // Pass kTraceStartup switch to renderer only if startup tracing has not
     // finished.
     renderer_cmd->AppendSwitchASCII(
         switches::kTraceStartup,
         browser_cmd.GetSwitchValueASCII(switches::kTraceStartup));
   }
 
@@ skipping 1224 matching lines @@
 
     // Skip widgets in other processes.
     if (rvh->GetProcess()->GetID() != GetID())
       continue;
 
     rvh->OnWebkitPreferencesChanged();
   }
 }
 
 }  // namespace content