Add private save-behind and draw-behind methods to canvas.HEADp9.0

The draw-behind  is a variant of drawPaint but is automatically clipped
to the bounds of the most recent saveBehind buffer (axis-aligned bounds).

No public exposure outside of the Android framework.

Impl is pretty simple (its a variant of drawPaint)
- find the most recent saveBehind device bounds
- if there is none, draw nothing, else
  - temporarily intersect the device's clip with that bounds
  - drawPaint
  - restore the clip

This patches did not apply cleanly and have been updated to compile
with a previous version of Skia. It was cherry-picked from the
following 3 Skia commits:
148b7fd3ad9c29dec0052de624c26ff291ef8f0a
d567408362bf7847d6000f6786f9a7b2c9d0b88b
9adc82c73df0ef25b708cae8aa48ef9c39ed4c67

Bug: 129117085
Test: None
Change-Id: I291f57885de6e95f749bf5cdb70ac16a5781ffb1

1 files changed, 7 insertions, 0 deletions

diff --git a/src/core/SkLiteRecorder.cpp b/src/core/SkLiteRecorder.cpp
index bd41ff3913..cc582e5978 100644
--- a/src/core/SkLiteRecorder.cpp
+++ b/src/core/SkLiteRecorder.cpp
@@ -37,6 +37,10 @@ SkCanvas::SaveLayerStrategy SkLiteRecorder::getSaveLayerStrategy(const SaveLayer
                    rec.fSaveLayerFlags);
     return SkCanvas::kNoLayer_SaveLayerStrategy;
 }
+bool SkLiteRecorder::onDoSaveBehind(const SkRect* subset) {
+    fDL->saveBehind(subset);
+    return false;
+}
 void SkLiteRecorder::willRestore() { fDL->restore(); }
 
 void SkLiteRecorder::didConcat   (const SkMatrix& matrix)   { fDL->   concat(matrix); }
@@ -63,6 +67,9 @@ void SkLiteRecorder::onClipRegion(const SkRegion& region, SkClipOp op) {
 void SkLiteRecorder::onDrawPaint(const SkPaint& paint) {
     fDL->drawPaint(paint);
 }
+void SkLiteRecorder::onDrawBehind(const SkPaint& paint) {
+    fDL->drawBehind(paint);
+}
 void SkLiteRecorder::onDrawPath(const SkPath& path, const SkPaint& paint) {
     fDL->drawPath(path, paint);
 }