Add feature for main frame before activation.

content/browser/gpu/compositor_util.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/compositor_util.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/sys_info.h"
 #include "build/build_config.h"
 #include "cc/base/math_util.h"
 #include "cc/base/switches.h"
 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "gpu/config/gpu_feature_type.h"
 
 namespace content {
 
 namespace {
 
 static bool IsGpuRasterizationBlacklisted() {
   GpuDataManagerImpl* manager = GpuDataManagerImpl::GetInstance();
   return manager->IsFeatureBlacklisted(
@@ skipping 244 matching lines @@
       msaa_sample_count >= kMinMSAASampleCount) {
     return msaa_sample_count;
   } else {
     DLOG(WARNING) << "Failed to parse switch "
                   << switches::kGpuRasterizationMSAASampleCount << ": "
                   << string_value;
     return 0;
   }
 }
 
+bool IsMainFrameBeforeActivationEnabled() {
+  if (base::SysInfo::NumberOfProcessors() < 4)
+    return false;
+
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+
+  if (command_line.HasSwitch(cc::switches::kDisableMainFrameBeforeActivation))
+    return false;
+
+  if (command_line.HasSwitch(cc::switches::kEnableMainFrameBeforeActivation))
+    return true;
+
+  return base::FeatureList::IsEnabled(features::kMainFrameBeforeActivation);
+}
+
 base::DictionaryValue* GetFeatureStatus() {
   GpuDataManagerImpl* manager = GpuDataManagerImpl::GetInstance();
   std::string gpu_access_blocked_reason;
   bool gpu_access_blocked =
       !manager->GpuAccessAllowed(&gpu_access_blocked_reason);
 
   base::DictionaryValue* feature_status_dict = new base::DictionaryValue();
 
   bool eof = false;
   for (size_t i = 0; !eof; ++i) {
@@ skipping 81 matching lines @@
     }
   }
   return problem_list;
 }
 
 std::vector<std::string> GetDriverBugWorkarounds() {
   return GpuDataManagerImpl::GetInstance()->GetDriverBugWorkarounds();
 }
 
 }  // namespace content