cc: Trigger GPU rasterization based on a per-layer hint

webkit/renderer/compositor_bindings/web_layer_impl.cc

Index: webkit/renderer/compositor_bindings/web_layer_impl.cc
diff --git a/webkit/renderer/compositor_bindings/web_layer_impl.cc b/webkit/renderer/compositor_bindings/web_layer_impl.cc
index 0cac5f9c69dc302985b7258e8f534b14a24438d0..cd35d92091a0fe31e173c3f022f9490d7b385c98 100644
--- a/webkit/renderer/compositor_bindings/web_layer_impl.cc
+++ b/webkit/renderer/compositor_bindings/web_layer_impl.cc
@@ -41,14 +41,7 @@ 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;
+bool g_impl_side_painting_enabled = false;
 
 }  // namespace
 
@@ -70,7 +63,12 @@ WebLayerImpl::~WebLayerImpl() {
 
 // static
 bool WebLayerImpl::UsingPictureLayer() {
-  return g_impl_side_painting_status.Get().enabled;
+  return g_impl_side_painting_enabled;
+}
+
+// static
+void WebLayerImpl::SetImplSidePaintingEnabled(bool enabled) {
+  g_impl_side_painting_enabled = enabled;
 }
 
 int WebLayerImpl::id() const { return layer_->id(); }
@@ -211,6 +209,10 @@ void WebLayerImpl::setBackgroundFilters(const WebFilterOperations& filters) {
   layer_->SetBackgroundFilters(filters_impl.AsFilterOperations());
 }
 
+void WebLayerImpl::setHasGpuRasterizationHint(bool has_hint) {
+  layer_->SetHasGpuRasterizationHint(has_hint);
+}
+
 void WebLayerImpl::setAnimationDelegate(
       blink::WebAnimationDelegate* delegate) {
   animation_delegate_adapter_.reset(