Omitting transform components when possible

Serialization of CSS transforms according to the spec involves omitting
components when possible without changing the meaning. In order to
adhere to this specification, the Y component of a 2-D transform
operation is omitted if it is 0.

Bug: 1181086
Change-Id: I8b92e27924204d0e4e6d095d0ec7220fee1f086e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3206107
Reviewed-by: Olga Gerchikov 
Reviewed-by: Anders Hartvoll Ruud 
Commit-Queue: Sahir Vellani 
Cr-Commit-Position: refs/heads/main@{#929822}

Author: sahirv

css/css-transforms/animation/transform-interpolation-computed-value.html

@@ -46,7 +46,7 @@
 
 interpolation_test('translateX(0px)', 'translateX(50px)', 'translateX(25px)');
 interpolation_test('translateX(0%)', 'translateX(50%)', 'translateX(25%)');
-interpolation_test('translateY(0%)', 'translateX(50%)', 'translate(25%, 0px)');
+interpolation_test('translateY(0%)', 'translateX(50%)', 'translate(25%)');
 interpolation_test('translateX(50px)', 'translateY(50px)', 'translate(25px, 25px)');
 interpolation_test('translateX(50px)', 'translateZ(50px)', 'translate3d(25px, 0px, 25px)');
 interpolation_test('translateZ(50px)', 'translateX(50px)', 'translate3d(25px, 0px, 25px)');
@@ -55,7 +55,8 @@
 interpolation_test('translate(50%)', 'translate(100%, 50%)', 'translate(75%, 25%)');
 interpolation_test('translate(0%, 50%)', 'translate(50%, 100%)', 'translate(25%, 75%)');
 interpolation_test('translate3d(0,0,-50px)','translateZ(50px)', 'translate3d(0px, 0px, 0px)');
-interpolation_test('translate(50px, 0px)', 'translate(100px, 0px)', 'translate(75px)')
+interpolation_test('translate(50px, 0px)', 'translate(100px, 0px)', 'translate(75px)');
+interpolation_test('translate(50px, -50px)', 'translate(100px, 50px)', 'translate(75px)');
 
 interpolation_test('rotate(30deg)', 'rotate(90deg)', 'rotate(60deg)');
 interpolation_test('rotateZ(30deg)', 'rotateZ(90deg)', 'rotateZ(60deg)');