Fix wrong transform for motion-path

We call ComputedStyle::applyTransform(..., ExcludeTransformOrigin,
IncludeMotionPath, ...) in PaintPropertyTreeBuilder updateTransform().
Previously in the case applyTransform() passed wrong (0,0) origin
when calling applyMotionPathTransform().

Always pass the correct origin to applyMotionPathTransform().

BUG=652323
TEST=css3/motion-path/path-establishes-stacking-context.html with --enable-blink-features=slimmingPaintInvalidation

Review-Url: https://codereview.chromium.org/2390173002
Cr-Commit-Position: refs/heads/master@{#422970}

third_party/WebKit/Source/core/style/ComputedStyle.cpp

@@ -1269,13 +1269,17 @@ void ComputedStyle::applyTransform(
   float originY = 0;
   float originZ = 0;
 
-  if (applyTransformOrigin) {
+  if (applyTransformOrigin ||
+      // We need to calculate originX and originY for applying motion path.
+      applyMotionPath == ComputedStyle::IncludeMotionPath) {
     originX =
         floatValueForLength(transformOriginX(), boundingBox.width()) + offsetX;
     originY =
         floatValueForLength(transformOriginY(), boundingBox.height()) + offsetY;
-    originZ = transformOriginZ();
-    result.translate3d(originX, originY, originZ);
+    if (applyTransformOrigin) {
+      originZ = transformOriginZ();
+      result.translate3d(originX, originY, originZ);
+    }
   }
 
   if (applyIndependentTransformProperties ==