Render Surface Content Rect from property trees

The content rect of a render surface is the union of
drawable content rects of all layers that draw into it
intersected with the clip rect of render surface if it is clipped.
As the layer tree will be gone post slimming paint v2,
calculating the content rects by walking the layer tree is
not a good idea. Also, the content rect is required in
CalculateRenderSurfaceLayerList, so we can't do the
computation after this function seperately. So, the
content rect computation is in
CalculateRenderSurfaceLayerList function itself and is
computed for the surface before it is used by the function.
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1291283007

Cr-Commit-Position: refs/heads/master@{#344683}

1 files changed, 7 insertions, 0 deletions

diff --git a/cc/trees/draw_property_utils.h b/cc/trees/draw_property_utils.h
index ef7f667..097b5a4 100644
--- a/cc/trees/draw_property_utils.h
+++ b/cc/trees/draw_property_utils.h
@@ -129,6 +129,10 @@ CanUseLcdTextFromPropertyTrees(const LayerImpl* layer,
                                bool can_use_lcd_text,
                                PropertyTrees* property_trees);
 
+gfx::Rect CC_EXPORT DrawableContentRectOfSurfaceFromPropertyTrees(
+    const RenderSurfaceImpl* render_surface,
+    const TransformTree& transform_tree);
+
 gfx::Rect CC_EXPORT
 DrawableContentRectFromPropertyTrees(const LayerImpl* layer,
                                      const TransformTree& transform_tree);
@@ -136,6 +140,9 @@ DrawableContentRectFromPropertyTrees(const LayerImpl* layer,
 gfx::Rect CC_EXPORT
 ClipRectFromPropertyTrees(const LayerImpl* layer,
                           const TransformTree& transform_tree);
+
+gfx::Rect CC_EXPORT ViewportRectFromPropertyTrees(const ClipTree& tree);
+
 }  // namespace cc
 
 #endif  // CC_TREES_DRAW_PROPERTY_UTILS_H_