cc: Remove racy initialization code in cc/base/switches.cc.

webkit/renderer/compositor_bindings/web_layer_impl.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 "webkit/renderer/compositor_bindings/web_layer_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event_impl.h"
+#include "base/lazy_instance.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_checker.h"
 #include "cc/animation/animation.h"
 #include "cc/base/region.h"
+#include "cc/base/switches.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_position_constraint.h"
 #include "third_party/WebKit/public/platform/WebCompositingReasons.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
 #include "third_party/WebKit/public/platform/WebFloatRect.h"
 #include "third_party/WebKit/public/platform/WebGraphicsLayerDebugInfo.h"
 #include "third_party/WebKit/public/platform/WebLayerClient.h"
 #include "third_party/WebKit/public/platform/WebLayerPositionConstraint.h"
 #include "third_party/WebKit/public/platform/WebLayerScrollClient.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/skia/include/utils/SkMatrix44.h"
 #include "webkit/renderer/compositor_bindings/web_animation_impl.h"
 #include "webkit/renderer/compositor_bindings/web_blend_mode.h"
 #include "webkit/renderer/compositor_bindings/web_filter_operations_impl.h"
 #include "webkit/renderer/compositor_bindings/web_to_cc_animation_delegate_adapter.h"
 
 using cc::Animation;
 using cc::Layer;
 using blink::WebLayer;
 using blink::WebFloatPoint;
 using blink::WebVector;
 using blink::WebRect;
 using blink::WebSize;
 using blink::WebColor;
 using blink::WebFilterOperations;
 
 namespace webkit {
+namespace {
+
+struct ImplSidePaintingStatus {
+  ImplSidePaintingStatus()
+      : enabled(cc::switches::IsImplSidePaintingEnabled()) {
+  }
+  bool enabled;
+};
+base::LazyInstance<ImplSidePaintingStatus> g_impl_side_painting_status =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
 
 WebLayerImpl::WebLayerImpl() : layer_(Layer::Create()) {
   web_layer_client_ = NULL;
   layer_->SetLayerClient(this);
 }
 
 WebLayerImpl::WebLayerImpl(scoped_refptr<Layer> layer) : layer_(layer) {
   web_layer_client_ = NULL;
   layer_->SetLayerClient(this);
 }
 
 WebLayerImpl::~WebLayerImpl() {
   layer_->ClearRenderSurface();
   layer_->set_layer_animation_delegate(NULL);
   web_layer_client_ = NULL;
 }
 
+// static
+bool WebLayerImpl::UsingPictureLayer() {
+  return g_impl_side_painting_status.Get().enabled;
+}
+
 int WebLayerImpl::id() const { return layer_->id(); }
 
 void WebLayerImpl::invalidateRect(const blink::WebFloatRect& rect) {
   layer_->SetNeedsDisplayRect(rect);
 }
 
 void WebLayerImpl::invalidate() { layer_->SetNeedsDisplay(); }
 
 void WebLayerImpl::addChild(WebLayer* child) {
   layer_->AddChild(static_cast<WebLayerImpl*>(child)->layer());
@@ skipping 375 matching lines @@
 void WebLayerImpl::setClipParent(blink::WebLayer* parent) {
   cc::Layer* clip_parent = NULL;
   if (parent)
     clip_parent = static_cast<WebLayerImpl*>(parent)->layer();
   layer_->SetClipParent(clip_parent);
 }
 
 Layer* WebLayerImpl::layer() const { return layer_.get(); }
 
 }  // namespace webkit