Skip both paint and raster invalidation for LayoutSVGHiddenContainer subtree

third_party/WebKit/Source/core/paint/PaintInvalidator.h

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.h
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.h b/third_party/WebKit/Source/core/paint/PaintInvalidator.h
index c3e1cc72dbfad7dddf1637845733cec4e7886081..00e4447adaafeac4ad6764d4aa6f70ac12366486 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidator.h
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.h
@@ -20,8 +20,7 @@ struct PaintInvalidatorContext {
 
   PaintInvalidatorContext(const PaintInvalidatorContext& parent_context)
       : parent_context(&parent_context),
-        forced_subtree_invalidation_flags(
-            parent_context.forced_subtree_invalidation_flags),
+        subtree_flags(parent_context.subtree_flags),
         paint_invalidation_container(
             parent_context.paint_invalidation_container),
         paint_invalidation_container_for_stacked_contents(
@@ -41,35 +40,33 @@ struct PaintInvalidatorContext {
       return true;
 #endif
     return object.NeedsPaintOffsetAndVisualRectUpdate() ||
-           (forced_subtree_invalidation_flags &
-            PaintInvalidatorContext::kForcedSubtreeVisualRectUpdate);
+           (subtree_flags & PaintInvalidatorContext::kSubtreeVisualRectUpdate);
   }
 
   const PaintInvalidatorContext* parent_context;
 
-  enum ForcedSubtreeInvalidationFlag {
-    kForcedSubtreeInvalidationChecking = 1 << 0,
-    kForcedSubtreeVisualRectUpdate = 1 << 1,
-    kForcedSubtreeFullInvalidation = 1 << 2,
-    kForcedSubtreeFullInvalidationForStackedContents = 1 << 3,
-    kForcedSubtreeSVGResourceChange = 1 << 4,
+  enum SubtreeFlag {
+    kSubtreeInvalidationChecking = 1 << 0,
+    kSubtreeVisualRectUpdate = 1 << 1,
+    kSubtreeFullInvalidation = 1 << 2,
+    kSubtreeFullInvalidationForStackedContents = 1 << 3,
+    kSubtreeSVGResourceChange = 1 << 4,
 
     // TODO(crbug.com/637313): This is temporary before we support filters in
     // paint property tree.
-    kForcedSubtreeSlowPathRect = 1 << 5,
+    kSubtreeSlowPathRect = 1 << 5,
 
-    // The paint invalidation tree walk invalidates paint caches, such as
-    // DisplayItemClients and subsequence caches, and also the regions
-    // into which objects raster pixels. When this flag is set, raster region
-    // invalidations are not issued.
+    // When this flag is set, no paint or raster invalidation will be issued
+    // for the subtree.
     //
     // Context: some objects in this paint walk, for example SVG resource
-    // container subtress, don't actually have any raster regions, because they
-    // are used as "painting subroutines" for one or more other locations in
-    // SVG.
-    kForcedSubtreeNoRasterInvalidation = 1 << 6,
+    // container subtrees, always paint onto temporary PaintControllers which
+    // don't have cache, and don't actually have any raster regions, so they
+    // don't need any invalidation. They are used as "painting subroutines"
+    // for one or more other locations in SVG.
+    kSubtreeNoInvalidation = 1 << 6,
   };
-  unsigned forced_subtree_invalidation_flags = 0;
+  unsigned subtree_flags = 0;
 
   // The following fields can be null only before
   // PaintInvalidator::updateContext().