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/include/android/SkAndroidFrameworkUtils.h b/include/android/SkAndroidFrameworkUtils.h
index 46d251626e..c2bf2b2bde 100644
--- a/include/android/SkAndroidFrameworkUtils.h
+++ b/include/android/SkAndroidFrameworkUtils.h
@@ -9,6 +9,7 @@
 #define SkAndroidFrameworkUtils_DEFINED
 
 #include "SkTypes.h"
+#include "SkRect.h"
 
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
 
@@ -32,6 +33,8 @@ public:
     static bool clipWithStencil(SkCanvas* canvas);
 #endif //SK_SUPPORT_GPU
 
+    static int SaveBehind(SkCanvas* canvas, const SkRect* subset);
+
     static void SafetyNetLog(const char*);
 };