Move Pepper 3D Image Chromium behind an experiment.

content/renderer/pepper/ppb_graphics_3d_impl.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/renderer/pepper/ppb_graphics_3d_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/web_preferences.h"
 #include "content/renderer/pepper/host_globals.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 #include "content/renderer/pepper/plugin_instance_throttler_impl.h"
 #include "content/renderer/pepper/plugin_module.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
@@ skipping 21 matching lines @@
     : PPB_Graphics3D_Shared(instance),
       bound_to_instance_(false),
       commit_pending_(false),
       has_alpha_(false),
       use_image_chromium_(false),
       weak_ptr_factory_(this) {
 #if defined(OS_MACOSX)
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   bool use_image_chromium =
       !command_line->HasSwitch(switches::kDisablePepper3DImageChromium);
+
+  if (use_image_chromium) {
+    use_image_chromium =
+        base::FeatureList::IsEnabled(features::kPepper3DImageChromium);
+  }
   use_image_chromium_ = use_image_chromium;
 #endif
 }
 
 PPB_Graphics3D_Impl::~PPB_Graphics3D_Impl() {
   // Unset the client before the command_buffer_ is destroyed, similar to how
   // WeakPtrFactory invalidates before it.
   if (command_buffer_)
     command_buffer_->SetGpuControlClient(nullptr);
 }
@@ skipping 292 matching lines @@
   if (!mailboxes_to_reuse_.empty()) {
     gpu::Mailbox mailbox = mailboxes_to_reuse_.back();
     mailboxes_to_reuse_.pop_back();
     return mailbox;
   }
 
   return gpu::Mailbox::Generate();
 }
 
 }  // namespace content