Add feature for main frame before activation.

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>
@@ skipping 1223 matching lines @@
     command_line->AppendSwitch(switches::kDisablePartialRaster);
 
   if (IsForceGpuRasterizationEnabled())
     command_line->AppendSwitch(switches::kForceGpuRasterization);
 
   if (IsGpuMemoryBufferCompositorResourcesEnabled()) {
     command_line->AppendSwitch(
         switches::kEnableGpuMemoryBufferCompositorResources);
   }
 
+  if (IsMainFrameBeforeActivationEnabled())
+    command_line->AppendSwitch(cc::switches::kEnableMainFrameBeforeActivation);
+
   // Persistent buffers may come at a performance hit (not all platform specific
   // buffers support it), so only enable them if partial raster is enabled and
   // we are actually going to use them.
   // TODO(dcastagna): Once GPU_READ_CPU_READ_WRITE_PERSISTENT is removed
   // kContentImageTextureTarget and kVideoImageTextureTarget can be merged into
   // one flag.
   gfx::BufferUsage buffer_usage =
       IsPartialRasterEnabled()
           ? gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT
           : gfx::BufferUsage::GPU_READ_CPU_READ_WRITE;
@@ skipping 207 matching lines @@
     switches::kUseRemoteCompositing,
     switches::kV,
     switches::kV8CacheStrategiesForCacheStorage,
     switches::kVideoThreads,
     switches::kVideoUnderflowThresholdMs,
     switches::kVModule,
     // Please keep these in alphabetical order. Compositor switches here should
     // also be added to chrome/browser/chromeos/login/chrome_restart_request.cc.
     cc::switches::kDisableCachedPictureRaster,
     cc::switches::kDisableCompositedAntialiasing,
-    cc::switches::kDisableMainFrameBeforeActivation,
     cc::switches::kDisableThreadedAnimation,
     cc::switches::kEnableBeginFrameScheduling,
     cc::switches::kEnableGpuBenchmarking,
     cc::switches::kEnableLayerLists,
-    cc::switches::kEnableMainFrameBeforeActivation,
     cc::switches::kEnableTileCompression,
     cc::switches::kShowCompositedLayerBorders,
     cc::switches::kShowFPSCounter,
     cc::switches::kShowLayerAnimationBounds,
     cc::switches::kShowPropertyChangedRects,
     cc::switches::kShowReplicaScreenSpaceRects,
     cc::switches::kShowScreenSpaceRects,
     cc::switches::kShowSurfaceDamageRects,
     cc::switches::kSlowDownRasterScaleFactor,
     cc::switches::kTopControlsHideThreshold,
@@ skipping 1278 matching lines @@
 
     // Skip widgets in other processes.
     if (rvh->GetProcess()->GetID() != GetID())
       continue;
 
     rvh->OnWebkitPreferencesChanged();
   }
 }
 
 }  // namespace content