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

content/public/common/content_switches.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/public/common/content_switches.h"
 
 #include "base/command_line.h"
 
 namespace switches {
 
@@ skipping 192 matching lines @@
     "disable-gpu-process-crash-limit";
 
 // Do not launch the GPU process shortly after browser process launch. Instead
 // launch it when it is first needed.
 const char kDisableGpuProcessPrelaunch[]    = "disable-gpu-process-prelaunch";
 
 // Disable GPU rasterization, i.e. rasterize on the CPU only.
 // Overrides the kEnableGpuRasterization and kForceGpuRasterization flags.
 const char kDisableGpuRasterization[]       = "disable-gpu-rasterization";
 
+// When using CPU rasterizing disable low resolution tiling. This uses
+// less power, particularly during animations, but more white may be seen
+// during fast scrolling especially on slower devices.
+const char kDisableLowResTiling[] = "disable-low-res-tiling";
+
 // Disable the GPU process sandbox.
 const char kDisableGpuSandbox[]             = "disable-gpu-sandbox";
 
 // Disable the thread that crashes the GPU process if it stops responding to
 // messages.
 const char kDisableGpuWatchdog[]            = "disable-gpu-watchdog";
 
 // Suppresses hang monitor dialogs in renderer processes.  This may allow slow
 // unload handlers on a page to prevent the tab from closing, but the Task
 // Manager can be used to terminate the offending process in this case.
@@ skipping 238 matching lines @@
 const char kEnableGestureTapHighlight[]     = "enable-gesture-tap-highlight";
 
 // Enables TRACE for GL calls in the renderer.
 const char kEnableGpuClientTracing[]        = "enable-gpu-client-tracing";
 
 // Allow heuristics to determine when a layer tile should be drawn with the
 // Skia GPU backend. Only valid with GPU accelerated compositing +
 // impl-side painting.
 const char kEnableGpuRasterization[]        = "enable-gpu-rasterization";
 
+// When using CPU rasterizing generate low resolution tiling. Low res
+// tiles may be displayed during fast scrolls especially on slower devices.
+const char kEnableLowResTiling[] = "enable-low-res-tiling";
+
 // See comment for kEnableCompositingForFixedPosition.
 const char kEnableHighDpiCompositingForFixedPosition[] =
      "enable-high-dpi-fixed-position-compositing";
 
 #if defined(OS_WIN)
 // Disable the Legacy Window which corresponds to the size of the WebContents.
 const char kDisableLegacyIntermediateWindow[] = "disable-legacy-window";
 
 // Enables the DirectWrite font rendering system on windows.
 const char kEnableDirectWrite[]             = "enable-direct-write";
@@ skipping 594 matching lines @@
 #endif
 
 #if defined(OS_POSIX)
 // Causes the child processes to cleanly exit via calling exit().
 const char kChildCleanExit[]                = "child-clean-exit";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches