Add flag to enable rendering of text using signed distance fields.

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 413 matching lines @@
 #else
     is_lcd_text_enabled_ = true;
 #endif
   }
 
   is_gpu_rasterization_enabled_ =
       command_line.HasSwitch(switches::kEnableGpuRasterization);
   is_gpu_rasterization_forced_ =
       command_line.HasSwitch(switches::kForceGpuRasterization);
 
+  if (command_line.HasSwitch(switches::kDisableDistanceFieldText)) {
+    is_distance_field_text_enabled_ = false;
+  } else if (command_line.HasSwitch(switches::kEnableDistanceFieldText)) {
+    is_distance_field_text_enabled_ =
+        is_gpu_rasterization_enabled_ || is_gpu_rasterization_forced_;

[enne (OOO), 2014/05/06 18:19:54]

I don't really like flags turning on other features indirectly unless it's a
requirement.  Can you remove the is_gpu_rasterization_forced_ clause?

[alokp, 2014/05/06 18:41:11]

I agree. This flag will be ignored anyway if gpu-rasterization is not used.

[jvanverth1, 2014/05/06 20:09:39]

Done.

+  } else {
+    is_distance_field_text_enabled_ = false;
+  }
+
   is_low_res_tiling_enabled_ = true;
   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);
@@ skipping 1048 matching lines @@
   hidden_widget_count_--;
 
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     return;
   }
 
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
 }
 
 }  // namespace content