ui: No more TestCompositor. Use NullDraw contexts in unit tests.

ui/compositor/compositor_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 "ui/compositor/compositor_switches.h"
 
 #include "base/command_line.h"
 
 namespace switches {
 
-const char kDisableTestCompositor[] = "disable-test-compositor";
+// Forces tests to produce pixel output when they normally wouldn't.
+const char kEnablePixelOutputInTests[] = "enable-pixel-output-in-tests";
 
 const char kUIDisableDeadlineScheduling[] = "ui-disable-deadline-scheduling";
 
 const char kUIDisableThreadedCompositing[] = "ui-disable-threaded-compositing";
 
 const char kUIEnableDeadlineScheduling[] = "ui-enable-deadline-scheduling";
 
 const char kUIEnableSoftwareCompositing[] = "ui-enable-software-compositing";
 
 const char kUIEnableThreadedCompositing[] = "ui-enable-threaded-compositing";
@@ skipping 12 matching lines @@
   enabled = true;
 
   // Flags override.
   enabled |= command_line.HasSwitch(switches::kUIEnableDeadlineScheduling);
   enabled &= !command_line.HasSwitch(switches::kUIDisableDeadlineScheduling);
 
   return enabled;
 }
 
 }  // namespace switches