Force delegated renderer on Aura

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 "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/common/content_constants.h"
@@ skipping 85 matching lines @@
       base::FieldTrialList::Find(kGpuCompositingFieldTrialName);
 
   // Force compositing is enabled in both the force compositing
   // and threaded compositing mode field trials.
   return trial &&
         (trial->group_name() ==
             kGpuCompositingFieldTrialForceCompositingEnabledName ||
          trial->group_name() == kGpuCompositingFieldTrialThreadEnabledName);
 }
 
+bool IsDelegatedRendererEnabled() {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  bool enabled = false;
+
+#if defined(USE_AURA)
+  // Default to true on Aura, but allow override via flags.
+  enabled = true;
+#endif
+
+  // Flags override.
+  enabled |= command_line.HasSwitch(switches::kEnableDelegatedRenderer);
+  enabled &= !command_line.HasSwitch(switches::kDisableDelegatedRenderer);
+
+  // Needs compositing, and thread.
+  if (enabled &&
+      (!IsForceCompositingModeEnabled() || !IsThreadedCompositingEnabled())) {
+    enabled = false;
+    LOG(ERROR) << "Disabling delegated-rendering because it needs "
+               << "force-compositing-mode and threaded-compositing.";
+  }
+
+  return enabled;
+}
+
 }  // namespace content