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

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index ec73e0913d91cecf324ad6c6cf601d274f15da46..d6ad15dccc9fab9813775ed373214e54a7fe3ac3 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -20,6 +20,7 @@ PictureLayer::PictureLayer(ContentLayerClient* client)
     pile_(make_scoped_refptr(new PicturePile())),
     instrumentation_object_tracker_(id()),
     is_mask_(false),
+    has_gpu_rasterization_hint_(false),
     update_source_frame_number_(-1) {
 }
 
@@ -51,6 +52,8 @@ void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
   }
 
   layer_impl->SetIsMask(is_mask_);
+  layer_impl->SetHasGpuRasterizationHint(has_gpu_rasterization_hint_);
+
   // Unlike other properties, invalidation must always be set on layer_impl.
   // See PictureLayerImpl::PushPropertiesTo for more details.
   layer_impl->invalidation_.Clear();
@@ -134,6 +137,14 @@ void PictureLayer::SetIsMask(bool is_mask) {
   is_mask_ = is_mask;
 }
 
+void PictureLayer::SetHasGpuRasterizationHint(bool has_hint) {
+  DCHECK(IsPropertyChangeAllowed());
+  if (has_gpu_rasterization_hint_ == has_hint)
+    return;
+  has_gpu_rasterization_hint_ = has_hint;
+  SetNeedsCommit();
+}
+
 bool PictureLayer::SupportsLCDText() const {
   return true;
 }