Roll external/skia dbe7770afc61..f6bf5169268f (4 commits)

https://skia.googlesource.com/skia.git/+log/dbe7770afc61..f6bf5169268f

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Change-Id: Id4f0c70ab27241a7ad3ae0798af3867ec2f7662a
diff --git a/Android.bp b/Android.bp
index 3fc7028..09ec4e1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1818,6 +1818,7 @@
         "tests/VkWrapTests.cpp",
         "tests/VkYcbcrSamplerTest.cpp",
         "tests/VptrTest.cpp",
+        "tests/WangsFormulaTest.cpp",
         "tests/WindowRectanglesTest.cpp",
         "tests/WritePixelsTest.cpp",
         "tests/Writer32Test.cpp",