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, 3 insertions, 0 deletions

diff --git a/src/core/SkSpecialImage.h b/src/core/SkSpecialImage.h
index d694fa22e2..1861bdb4cf 100644
--- a/src/core/SkSpecialImage.h
+++ b/src/core/SkSpecialImage.h
@@ -76,6 +76,9 @@ public:
     static sk_sp<SkSpecialImage> MakeFromRaster(const SkIRect& subset,
                                                 const SkBitmap&,
                                                 const SkSurfaceProps* = nullptr);
+    static sk_sp<SkSpecialImage> CopyFromRaster(const SkIRect& subset,
+                                                const SkBitmap&,
+                                                const SkSurfaceProps* = nullptr);
 #if SK_SUPPORT_GPU
     static sk_sp<SkSpecialImage> MakeDeferredFromGpu(GrContext*,
                                                      const SkIRect& subset,