Fixes labelOffset not working for vertical axes

src/core/core.scale.js

@@ -619,7 +619,7 @@ module.exports = function(Chart) {
 
 					var yLineValue = me.getPixelForTick(index); // xvalues for grid lines
 					yLineValue += helpers.aliasPixel(lineWidth);
-					labelY = me.getPixelForTick(index, gridLines.offsetGridLines);
+					labelY = me.getPixelForTick(index, gridLines.offsetGridLines) + optionTicks.labelOffset;
 
 					tx1 = xTickStart;
 					tx2 = xTickEnd;

test/fixtures/core.scale/label-offset-vertical-axes.json

@@ -0,0 +1,36 @@
+{
+    "config": {
+        "type": "horizontalBar",
+        "data": {
+            "labels": ["Red", "Blue", "Yellow", "Green"],
+            "datasets": [{
+                "data": [12, 19, 3, 5]
+            }]
+        },
+        "options": {
+            "responsive": false,
+            "spanGaps": true,
+            "legend": false,
+            "title": false,
+            "scales": {
+                "xAxes": [{
+                    "ticks": {
+                        "display": false
+                    }
+                }],
+                "yAxes": [{
+                    "ticks": {
+                        "mirror": true,
+                        "labelOffset": -30
+                    }
+                }]
+            }
+        }
+    },
+    "options": {
+        "canvas": {
+            "height": 256,
+            "width": 512
+        }
+    }
+}

test/specs/core.scale.tests.js

@@ -0,0 +1,3 @@
+describe('Core.scale', function() {
+	describe('auto', jasmine.specsFromFixtures('core.scale'));
+});