Remove all calls to SkCanvas::getClipStack from HWUI unit tests

Refactor HWUI unit tests to not invoke SkCanvas::getClipStack,
because this Skia API is going to be deprecated.

Test: Build and ran sailfish-eng. Ran HWUI unit tests.
Change-Id: Iac277aa26fbe9e2a0860cde2dd43732ed1c4c4e3
diff --git a/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp b/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp
index f5ff058..2f1eae3 100644
--- a/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp
+++ b/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp
@@ -865,10 +865,8 @@
         void onDrawPaint(const SkPaint&) {
             switch (mDrawCounter++) {
             case 0:
-                // While this mirrors FrameBuilder::colorOp_unbounded, this value is different
-                // because there is no root (root is clipped in SkiaPipeline::renderFrame).
-                // SkiaPipeline.clipped and clip_replace verify the root clip.
-                EXPECT_TRUE(TestUtils::getClipBounds(this).isEmpty());
+                EXPECT_EQ(SkRect::MakeWH(CANVAS_WIDTH, CANVAS_HEIGHT),
+                        TestUtils::getClipBounds(this));
                 break;
             case 1:
                 EXPECT_EQ(SkRect::MakeWH(10, 10), TestUtils::getClipBounds(this));