added text enhancement regression tests

test/driver.js

@@ -64,7 +64,8 @@ var rasterizeTextLayer = (function rasterizeTextLayerClosure() {
     return textLayerStylePromise;
   }
 
-  function rasterizeTextLayer(ctx, viewport, textContent) {
+  function rasterizeTextLayer(ctx, viewport, textContent,
+                              enhanceTextSelection) {
     return new Promise(function (resolve) {
       // Building SVG with size of the viewport.
       var svg = document.createElementNS(SVG_NS, 'svg:svg');
@@ -470,12 +471,13 @@ var Driver = (function DriverClosure() {
               var textLayerContext = textLayerCanvas.getContext('2d');
               textLayerContext.clearRect(0, 0,
                 textLayerCanvas.width, textLayerCanvas.height);
+              var enhanceText = !!task.enhance;
               // The text builder will draw its content on the test canvas
               initPromise = page.getTextContent({
                 normalizeWhitespace: true,
               }).then(function(textContent) {
                 return rasterizeTextLayer(textLayerContext, viewport,
-                                          textContent);
+                                          textContent, enhanceText);
               });
             } else {
               textLayerCanvas = null;

test/test_manifest.json

@@ -23,6 +23,13 @@
        "rounds": 1,
        "type": "text"
     },
+    {  "id": "tracemonkey-text-enhance",
+       "file": "pdfs/tracemonkey.pdf",
+       "md5": "9a192d8b1a7dc652a19835f6f08098bd",
+       "rounds": 1,
+       "enhance": true,
+       "type": "text"
+    },
     {  "id": "issue3925",
        "file": "pdfs/issue3925.pdf",
        "md5": "c5c895deecf7a7565393587e0d61be2b",
@@ -331,12 +338,28 @@
        "lastPage": 4,
        "type": "text"
     },
+    {  "id": "taro-text-enhance",
+       "file": "pdfs/TaroUTR50SortedList112.pdf",
+       "md5": "ce63eab622ff473a43f8a8de85ef8a46",
+       "link":true,
+       "rounds": 1,
+       "lastPage": 4,
+       "enhance": true,
+       "type": "text"
+    },
     {  "id": "rotated-text",
        "file": "pdfs/rotated.pdf",
        "md5": "aed187f53e969ccdcbab0bb4c59f9e46",
        "rounds": 1,
        "type": "text"
     },
+    {  "id": "rotated-text-enhance",
+       "file": "pdfs/rotated.pdf",
+       "md5": "aed187f53e969ccdcbab0bb4c59f9e46",
+       "rounds": 1,
+       "enhance": true,
+       "type": "text"
+    },
     {
       "id": "issue3115",
       "file": "pdfs/issue3115r.pdf",