Make IsSolidColor() a property on CC scrollbar layers.

content/browser/renderer_host/render_process_host_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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 990 matching lines @@
     cc::switches::kCompositeToMailbox,
     cc::switches::kDisableColorEstimator,
     cc::switches::kDisableImplSidePainting,
     cc::switches::kDisableThreadedAnimation,
     cc::switches::kEnableImplSidePainting,
     cc::switches::kEnablePartialSwap,
     cc::switches::kEnablePerTilePainting,
     cc::switches::kEnablePinchVirtualViewport,
     cc::switches::kEnableTopControlsPositionCalculation,
     cc::switches::kForceDirectLayerDrawing,
+    cc::switches::kForceSolidColorScrollbars,
     cc::switches::kLowResolutionContentsScaleFactor,
     cc::switches::kMaxTilesForInterestArea,
     cc::switches::kMaxUnusedResourceMemoryUsagePercentage,
     cc::switches::kNumRasterThreads,
     cc::switches::kShowCompositedLayerBorders,
     cc::switches::kShowFPSCounter,
     cc::switches::kShowNonOccludingRects,
     cc::switches::kShowOccludingRects,
     cc::switches::kShowPropertyChangedRects,
     cc::switches::kShowReplicaScreenSpaceRects,
@@ skipping 755 matching lines @@
     // Skip widgets in other processes.
     if (widgets[i]->GetProcess()->GetID() != GetID())
       continue;
 
     RenderViewHost* rvh = RenderViewHost::From(widgets[i]);
     rvh->UpdateWebkitPreferences(rvh->GetWebkitPreferences());
   }
 }
 
 }  // namespace content