Add --disable-low-res-tiling. Disable low res tiling to save power.

content/renderer/render_thread_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/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 418 matching lines @@
       !command_line.HasSwitch(switches::kDisableGpuRasterization)) {
     if (command_line.HasSwitch(switches::kForceGpuRasterization)) {
       is_gpu_rasterization_forced_ = true;
     } else if (command_line.HasSwitch(switches::kEnableGpuRasterization) ||
                command_line.HasSwitch(
                    switches::kEnableBleedingEdgeRenderingFastPaths)) {
       is_gpu_rasterization_enabled_ = true;
     }
   }
 
+  is_low_res_tiling_enabled_ = !is_gpu_rasterization_enabled_;
+  if (command_line.HasSwitch(switches::kDisableLowResTiling) &&
+      !command_line.HasSwitch(switches::kEnableLowResTiling)) {
+    is_low_res_tiling_enabled_ = false;
+  }
+
   // Note that under Linux, the media library will normally already have
   // been initialized by the Zygote before this instance became a Renderer.
   base::FilePath media_path;
   PathService::Get(DIR_MEDIA_LIBS, &media_path);
   if (!media_path.empty())
     media::InitializeMediaLibrary(media_path);
 
   memory_pressure_listener_.reset(new base::MemoryPressureListener(
       base::Bind(&RenderThreadImpl::OnMemoryPressure, base::Unretained(this))));
 
@@ skipping 1040 matching lines @@
   hidden_widget_count_--;
 
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     return;
   }
 
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
 }
 
 }  // namespace content