Add layer bounds to compositing_dislay_item

This patch adds an SkRect for bounds to compositing_display_item and
uses it for setting the canvas layer bounds. With this patch and the
associated blink-side patch [1] we pass the following additional
layout tests:
LayoutTests/svg/zoom/page/zoom-mask-with-percentages.svg
LayoutTests/svg/transforms/text-with-mask-with-svg-transform.svg
LayoutTests/svg/custom/absolute-sized-content-with-resources.xhtml
LayoutTests/svg/custom/mask-excessive-malloc.svg
LayoutTests/svg/batik/masking/maskRegions.svg

[1] https://codereview.chromium.org/960483002

Review URL: https://codereview.chromium.org/952123002

Cr-Commit-Position: refs/heads/master@{#318127}

1 files changed, 10 insertions, 1 deletions

diff --git a/cc/blink/web_display_item_list_impl.cc b/cc/blink/web_display_item_list_impl.cc
index 5cbac73..b1f1211 100644
--- a/cc/blink/web_display_item_list_impl.cc
+++ b/cc/blink/web_display_item_list_impl.cc
@@ -98,12 +98,21 @@ void WebDisplayItemListImpl::appendEndTransparencyItem() {
   display_item_list_->AppendItem(cc::EndTransparencyDisplayItem::Create());
 }
 
+// TODO(pdr): Remove this once the blink-side callers have been removed.
 void WebDisplayItemListImpl::appendCompositingItem(
     float opacity,
     SkXfermode::Mode xfermode,
     SkColorFilter* color_filter) {
+  appendCompositingItem(opacity, xfermode, nullptr, color_filter);
+}
+
+void WebDisplayItemListImpl::appendCompositingItem(
+    float opacity,
+    SkXfermode::Mode xfermode,
+    SkRect* bounds,
+    SkColorFilter* color_filter) {
   display_item_list_->AppendItem(cc::CompositingDisplayItem::Create(
-      opacity, xfermode, skia::SharePtr(color_filter)));
+      opacity, xfermode, bounds, skia::SharePtr(color_filter)));
 }
 
 void WebDisplayItemListImpl::appendEndCompositingItem() {