Use neutralKeyframe sentinal instead of '' for interpolation-test.js tests

third_party/WebKit/LayoutTests/animations/interpolation/box-shadow-interpolation-expected.txt

Index: third_party/WebKit/LayoutTests/animations/interpolation/box-shadow-interpolation-expected.txt
diff --git a/third_party/WebKit/LayoutTests/animations/interpolation/box-shadow-interpolation-expected.txt b/third_party/WebKit/LayoutTests/animations/interpolation/box-shadow-interpolation-expected.txt
index c8209e17808ad0f33a907ace5537dfd30fb36833..80f105f600f88bf1d9475a1c6f4fcf09b6adbdeb 100644
--- a/third_party/WebKit/LayoutTests/animations/interpolation/box-shadow-interpolation-expected.txt
+++ b/third_party/WebKit/LayoutTests/animations/interpolation/box-shadow-interpolation-expected.txt
@@ -1,11 +1,11 @@
 This is a testharness.js-based test.
 PASS This test uses interpolation-test.js. 
-PASS CSS Transitions: property <box-shadow> from [] to [20px 20px 20px 20px black] at (-0.3) is [rgb(0, 0, 0) 7px 33px 7px 33px] 
-PASS CSS Transitions: property <box-shadow> from [] to [20px 20px 20px 20px black] at (0) is [rgb(0, 0, 0) 10px 30px 10px 30px] 
-PASS CSS Transitions: property <box-shadow> from [] to [20px 20px 20px 20px black] at (0.3) is [rgb(0, 0, 0) 13px 27px 13px 27px] 
-PASS CSS Transitions: property <box-shadow> from [] to [20px 20px 20px 20px black] at (0.6) is [rgb(0, 0, 0) 16px 24px 16px 24px] 
-PASS CSS Transitions: property <box-shadow> from [] to [20px 20px 20px 20px black] at (1) is [rgb(0, 0, 0) 20px 20px 20px 20px] 
-PASS CSS Transitions: property <box-shadow> from [] to [20px 20px 20px 20px black] at (1.5) is [rgb(0, 0, 0) 25px 15px 25px 15px] 
+PASS CSS Transitions: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (-0.3) is [rgb(0, 0, 0) 7px 33px 7px 33px] 
+PASS CSS Transitions: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0) is [rgb(0, 0, 0) 10px 30px 10px 30px] 
+PASS CSS Transitions: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0.3) is [rgb(0, 0, 0) 13px 27px 13px 27px] 
+PASS CSS Transitions: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0.6) is [rgb(0, 0, 0) 16px 24px 16px 24px] 
+PASS CSS Transitions: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (1) is [rgb(0, 0, 0) 20px 20px 20px 20px] 
+PASS CSS Transitions: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (1.5) is [rgb(0, 0, 0) 25px 15px 25px 15px] 
 PASS CSS Transitions: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (-0.3) is [rgba(0, 0, 0, 0) -6px -6px 0px -6px] 
 PASS CSS Transitions: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (0) is [none] 
 PASS CSS Transitions: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (0.3) is [rgba(0, 0, 0, 0.301961) 6px 6px 6px 6px] 
@@ -61,12 +61,12 @@ PASS CSS Transitions: property <box-shadow> from [10px 20px yellow, 5px 10px gre
 PASS CSS Transitions: property <box-shadow> from [10px 20px yellow, 5px 10px green] to [inset 5px 10px green, 15px 20px blue] at (0.6) is [rgb(0, 128, 0) 5px 10px 0px 0px inset, rgb(0, 0, 255) 15px 20px 0px 0px] 
 PASS CSS Transitions: property <box-shadow> from [10px 20px yellow, 5px 10px green] to [inset 5px 10px green, 15px 20px blue] at (1) is [rgb(0, 128, 0) 5px 10px 0px 0px inset, rgb(0, 0, 255) 15px 20px 0px 0px] 
 PASS CSS Transitions: property <box-shadow> from [10px 20px yellow, 5px 10px green] to [inset 5px 10px green, 15px 20px blue] at (1.5) is [rgb(0, 128, 0) 5px 10px 0px 0px inset, rgb(0, 0, 255) 15px 20px 0px 0px] 
-PASS CSS Animations: property <box-shadow> from [] to [20px 20px 20px 20px black] at (-0.3) is [rgb(0, 0, 0) 7px 33px 7px 33px] 
-PASS CSS Animations: property <box-shadow> from [] to [20px 20px 20px 20px black] at (0) is [rgb(0, 0, 0) 10px 30px 10px 30px] 
-PASS CSS Animations: property <box-shadow> from [] to [20px 20px 20px 20px black] at (0.3) is [rgb(0, 0, 0) 13px 27px 13px 27px] 
-PASS CSS Animations: property <box-shadow> from [] to [20px 20px 20px 20px black] at (0.6) is [rgb(0, 0, 0) 16px 24px 16px 24px] 
-PASS CSS Animations: property <box-shadow> from [] to [20px 20px 20px 20px black] at (1) is [rgb(0, 0, 0) 20px 20px 20px 20px] 
-PASS CSS Animations: property <box-shadow> from [] to [20px 20px 20px 20px black] at (1.5) is [rgb(0, 0, 0) 25px 15px 25px 15px] 
+PASS CSS Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (-0.3) is [rgb(0, 0, 0) 7px 33px 7px 33px] 
+PASS CSS Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0) is [rgb(0, 0, 0) 10px 30px 10px 30px] 
+PASS CSS Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0.3) is [rgb(0, 0, 0) 13px 27px 13px 27px] 
+PASS CSS Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0.6) is [rgb(0, 0, 0) 16px 24px 16px 24px] 
+PASS CSS Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (1) is [rgb(0, 0, 0) 20px 20px 20px 20px] 
+PASS CSS Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (1.5) is [rgb(0, 0, 0) 25px 15px 25px 15px] 
 PASS CSS Animations: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (-0.3) is [rgba(0, 0, 0, 0) -6px -6px 0px -6px] 
 PASS CSS Animations: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (0) is [none] 
 PASS CSS Animations: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (0.3) is [rgba(0, 0, 0, 0.301961) 6px 6px 6px 6px] 
@@ -122,6 +122,12 @@ PASS CSS Animations: property <box-shadow> from [10px 20px yellow, 5px 10px gree
 PASS CSS Animations: property <box-shadow> from [10px 20px yellow, 5px 10px green] to [inset 5px 10px green, 15px 20px blue] at (0.6) is [rgb(0, 128, 0) 5px 10px 0px 0px inset, rgb(0, 0, 255) 15px 20px 0px 0px] 
 PASS CSS Animations: property <box-shadow> from [10px 20px yellow, 5px 10px green] to [inset 5px 10px green, 15px 20px blue] at (1) is [rgb(0, 128, 0) 5px 10px 0px 0px inset, rgb(0, 0, 255) 15px 20px 0px 0px] 
 PASS CSS Animations: property <box-shadow> from [10px 20px yellow, 5px 10px green] to [inset 5px 10px green, 15px 20px blue] at (1.5) is [rgb(0, 128, 0) 5px 10px 0px 0px inset, rgb(0, 0, 255) 15px 20px 0px 0px] 
+PASS Web Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (-0.3) is [rgb(0, 0, 0) 7px 33px 7px 33px] 
+PASS Web Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0) is [rgb(0, 0, 0) 10px 30px 10px 30px] 
+PASS Web Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0.3) is [rgb(0, 0, 0) 13px 27px 13px 27px] 
+PASS Web Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (0.6) is [rgb(0, 0, 0) 16px 24px 16px 24px] 
+PASS Web Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (1) is [rgb(0, 0, 0) 20px 20px 20px 20px] 
+PASS Web Animations: property <box-shadow> from neutral to [20px 20px 20px 20px black] at (1.5) is [rgb(0, 0, 0) 25px 15px 25px 15px] 
 PASS Web Animations: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (-0.3) is [rgba(0, 0, 0, 0) -6px -6px 0px -6px] 
 PASS Web Animations: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (0) is [none] 
 PASS Web Animations: property <box-shadow> from [initial] to [20px 20px 20px 20px black] at (0.3) is [rgba(0, 0, 0, 0.301961) 6px 6px 6px 6px]