Turn on enable begin frame scheduling by default

content/browser/compositor/browser_compositor_output_surface.cc

 // Copyright 2014 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/compositor/browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 13 matching lines @@
     scoped_refptr<cc::ContextProvider> context_provider,
     scoped_refptr<ui::CompositorVSyncManager> vsync_manager,
     cc::SyntheticBeginFrameSource* begin_frame_source,
     std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
         overlay_candidate_validator)
     : OutputSurface(std::move(context_provider), nullptr, nullptr),
       vsync_manager_(std::move(vsync_manager)),
       synthetic_begin_frame_source_(begin_frame_source),
       reflector_(nullptr),
       use_begin_frame_scheduling_(
-          base::CommandLine::ForCurrentProcess()->HasSwitch(
-              cc::switches::kEnableBeginFrameScheduling)) {
+          !base::CommandLine::ForCurrentProcess()->HasSwitch(
+              cc::switches::kDisableBeginFrameScheduling)) {
   overlay_candidate_validator_ = std::move(overlay_candidate_validator);
   Initialize();
 }
 
 BrowserCompositorOutputSurface::BrowserCompositorOutputSurface(
     std::unique_ptr<cc::SoftwareOutputDevice> software_device,
     const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
     cc::SyntheticBeginFrameSource* begin_frame_source)
     : OutputSurface(nullptr, nullptr, std::move(software_device)),
       vsync_manager_(vsync_manager),
       synthetic_begin_frame_source_(begin_frame_source),
       reflector_(nullptr),
       use_begin_frame_scheduling_(
-          base::CommandLine::ForCurrentProcess()->HasSwitch(
-              cc::switches::kEnableBeginFrameScheduling)) {
+          !base::CommandLine::ForCurrentProcess()->HasSwitch(
+              cc::switches::kDisableBeginFrameScheduling)) {
   Initialize();
 }
 
 BrowserCompositorOutputSurface::BrowserCompositorOutputSurface(
     const scoped_refptr<cc::VulkanContextProvider>& vulkan_context_provider,
     const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
     cc::SyntheticBeginFrameSource* begin_frame_source)
     : OutputSurface(std::move(vulkan_context_provider)),
       vsync_manager_(vsync_manager),
       synthetic_begin_frame_source_(begin_frame_source),
@@ skipping 77 matching lines @@
 BrowserCompositorOutputSurface::CreateCompositionStartedCallback() {
   return base::Closure();
 }
 
 cc::OverlayCandidateValidator*
 BrowserCompositorOutputSurface::GetOverlayCandidateValidator() const {
   return overlay_candidate_validator_.get();
 }
 
 }  // namespace content