Add a command-line flag to set GPU rasterization multisampling.

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"
 #include "base/metrics/field_trial.h"
 
 namespace switches {
@@ skipping 478 matching lines @@
 // This option is also used by the browser to send the list of trials to
 // renderers, using the same format. See
 // FieldTrialList::CreateTrialsFromString() in field_trial.h for details.
 const char kForceFieldTrials[]              = "force-fieldtrials";
 
 // Always use the Skia GPU backend for drawing layer tiles. Only valid with GPU
 // accelerated compositing + impl-side painting. Overrides the
 // kEnableGpuRasterization flag.
 const char kForceGpuRasterization[]        = "force-gpu-rasterization";
 
+// The number of multisample antialiasing samples for GPU rasterization.
+// Requires MSAA support on GPU to have an effect. 0 disables MSAA.
+const char kGpuRasterizationMSAASampleCount[] =
+    "gpu-rasterization-msaa-sample-count";
+
 // Force renderer accessibility to be on instead of enabling it on demand when
 // a screen reader is detected. The disable-renderer-accessibility switch
 // overrides this if present.
 const char kForceRendererAccessibility[]    = "force-renderer-accessibility";
 
 // Always use text blob rendering, overriding kDisableTextBlobs and any
 // heuristics that may otherwise disable it.
 // TODO(fmalita): remove after --disable-impl-side-painting is phased out.
 const char kForceTextBlobs[]                = "force-text-blobs";
 
@@ skipping 462 matching lines @@
   if (cmd_line->HasSwitch(kDisableWin32kRendererLockDown))
     return false;
   // Default.
   return group_name == "Enabled";
 }
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches