Make IsSolidColor() a property on CC scrollbar layers.

cc/trees/layer_tree_host.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 
 #include "base/bind.h"
@@ skipping 159 matching lines @@
     size_t max_partial_texture_updates = 0;
     if (proxy_->GetRendererCapabilities().allow_partial_texture_updates &&
         !settings_.impl_side_painting) {
       max_partial_texture_updates = std::min(
           settings_.max_partial_texture_updates,
           proxy_->MaxPartialTextureUpdates());
     }
     settings_.max_partial_texture_updates = max_partial_texture_updates;
 
     if (!contents_texture_manager_ &&
-        (!settings_.impl_side_painting || !settings_.solid_color_scrollbars)) {
+        (!settings_.impl_side_painting ||
+         !settings_.force_solid_color_scrollbars)) {
       contents_texture_manager_ =
           PrioritizedResourceManager::Create(proxy_.get());
       surface_memory_placeholder_ =
           contents_texture_manager_->CreateTexture(gfx::Size(), GL_RGBA);
     }
 
     client_->DidInitializeOutputSurface(true);
     return CreateSucceeded;
   }
 
@@ skipping 857 matching lines @@
     bool start_ready_animations = true;
     (*iter).second->UpdateState(start_ready_animations, NULL);
   }
 }
 
 skia::RefPtr<SkPicture> LayerTreeHost::CapturePicture() {
   return proxy_->CapturePicture();
 }
 
 }  // namespace cc