Move all fast-path paint invalidation mapping into PaintInvalidationState

- Remove the optional const PaintInvalidationState* parameter from paint
  invalidation mapping methods and move fast-path mapping code into
  PaintInvalidationState.

- PaintLayer::computePaintInvalidationRect() is now
    PaintInvalidationState::computePaintInvalidationRectInBacking();
  PaintLayer::positionFromPaintInvalidationBacking() is now
    PaintInvalidationState::positionFromPaintInvalidationBacking();
  PaintLayer::mapRectToPaintInvalidationBacking() is now
    PaintInvalidationState::mapLocalRectToPaintInvalidationBacking().

- Change LayoutObject::clippedOverflowRectForPaintInvalidationBacking() to:
  * Non-SVG objects and LayoutSVGRoot:
    LayoutObject::localOverflowRectForPaintInvalidation() which doesn't
    map the rect to paint invalidation backing;
  * SVG objects except LayoutSVGRoot:
    Using existing paintInvalidationRectInLocalSVGCoordinates()

  PaintInvalidationState::computePaintInvalidationRectInBacking(),
  calls the above functions to get the local paint invalidation rect,
  and map to paintInvalidationContainer using fast path if possible,
  or slow path by calling LayoutObject::mapToVisibleRectToAncestor().

- Let selection paint invalidation go through fast-path if possible.

BUG=591199

Review URL: https://codereview.chromium.org/1813383002

Cr-Commit-Position: refs/heads/master@{#383430}

1 files changed, 7 insertions, 5 deletions

diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.cpp b/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.cpp
index 259d6f3..4ee1f83 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.cpp
@@ -231,12 +231,14 @@ void LayoutSVGInlineText::computeNewScaledFontForStyle(LayoutObject* layoutObjec
     scaledFont.update(document.styleEngine().fontSelector());
 }
 
-LayoutRect LayoutSVGInlineText::clippedOverflowRectForPaintInvalidation(const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
+LayoutRect LayoutSVGInlineText::absoluteClippedOverflowRect() const
 {
-    // FIXME: The following works because LayoutSVGBlock has forced slow rect mapping of the paintInvalidationState.
-    // Should let this really work with paintInvalidationState's fast mapping and remove the assert.
-    ASSERT(!paintInvalidationState || !paintInvalidationState->canMapToAncestor(paintInvalidationContainer));
-    return parent()->clippedOverflowRectForPaintInvalidation(paintInvalidationContainer, nullptr);
+    return parent()->absoluteClippedOverflowRect();
+}
+
+FloatRect LayoutSVGInlineText::paintInvalidationRectInLocalSVGCoordinates() const
+{
+    return parent()->paintInvalidationRectInLocalSVGCoordinates();
 }
 
 PassRefPtr<StringImpl> LayoutSVGInlineText::originalText() const