Fixes mesh fill pattern with optional matrix (#5020)

In the referenced issue, there is a PDF which uses a fill pattern which does not
have a matrix defined. This causes singularValueDecompose2dScale to fail with
undefined property error when accessing elements of that matrix.

This fix will only use the matrix when it is defined. The output for the PDF in
question now looks identical to chrome and preview with respect to the gradient
fill pattern.

src/display/pattern_helper.js

@@ -226,24 +226,24 @@ ShadingIRs.Mesh = {
     return {
       type: 'Pattern',
       getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
-        var combinedScale;
+        var scale;
-        // Obtain scale from matrix and current transformation matrix.
         if (shadingFill) {
-          combinedScale = Util.singularValueDecompose2dScale(
+          scale = Util.singularValueDecompose2dScale(ctx.mozCurrentTransform);
-            ctx.mozCurrentTransform);
         } else {
-          var matrixScale = Util.singularValueDecompose2dScale(matrix);
+          // Obtain scale from matrix and current transformation matrix.
-          var curMatrixScale = Util.singularValueDecompose2dScale(
+          scale = Util.singularValueDecompose2dScale(owner.baseTransform);
-            owner.baseTransform);
+          if (matrix) {
-          combinedScale = [matrixScale[0] * curMatrixScale[0],
+            var matrixScale = Util.singularValueDecompose2dScale(matrix);
-            matrixScale[1] * curMatrixScale[1]];
+            scale = [scale[0] * matrixScale[0],
+                     scale[1] * matrixScale[1]];
+          }
         }
 
 
         // Rasterizing on the main thread since sending/queue large canvases
         // might cause OOM.
-        var temporaryPatternCanvas = createMeshCanvas(bounds, combinedScale,
+        var temporaryPatternCanvas = createMeshCanvas(bounds, scale, coords,
-          coords, colors, figures, shadingFill ? null : background);
+          colors, figures, shadingFill ? null : background);
 
         if (!shadingFill) {
           ctx.setTransform.apply(ctx, owner.baseTransform);