Font size in DomDistiller prefs syncs with local scaling

components/test/data/dom_distiller/pinch_tester.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var pinchtest = (function() {
   'use strict';
 
   function assertTrue(condition, message) {
     if (!condition) {
       message = message || "Assertion failed";
@@ skipping 351 matching lines @@
     t.updateTouchPoint(0, 100, 100);
     t.updateTouchPoint(1, 100, 100);
     pincher.handleTouchMove(t.events());
     assertTrue(pincher.status().clampedScale < 0.9);
     assertTrue(pincher.status().clampedScale > 0);
     assertTrue(pincher.status().scale > 0);
 
     pincher.handleTouchCancel();
   }
 
+  function testFontScaling() {
+    pincher.reset();
+    useFontScaling(1.5);
+    assertClose(pincher.status().clampedScale, 1.5);
+
+    var t = new touch();
+
+    var oldState = pincher.status();

[nyquist, 2015/08/11 06:27:57]

Would it be possible to add a one line comment above each of these sections?

Something like:
- Start touch
- Pinch-in
- Verified scale is less

- clear state, and re-initialize

- Start touch
- Pinch-out
- Verified scale is more

But probably  with some better text, but something along those lines?

It would make it both simple to understand this test overall, and also to verify
each section.

[wychen, 2015/08/31 21:47:39]

Done.

+    t.addTouchPoint(100, 100);
+    pincher.handleTouchStart(t.events());
+    t.addTouchPoint(300, 300);
+    pincher.handleTouchStart(t.events());
+
+    t.updateTouchPoint(0, 150, 150);
+    t.updateTouchPoint(1, 250, 250);
+    pincher.handleTouchMove(t.events());
+    assertTrue(pincher.status().clampedScale < 0.9 * oldState.clampedScale);
+
+    pincher.handleTouchCancel();
+
+    useFontScaling(0.8);
+    assertClose(pincher.status().clampedScale, 0.8);
+
+    t = new touch();
+    oldState = pincher.status();
+    t.addTouchPoint(150, 150);
+    pincher.handleTouchStart(t.events());
+    t.addTouchPoint(250, 250);
+    pincher.handleTouchStart(t.events());
+
+    t.updateTouchPoint(0, 100, 100);
+    t.updateTouchPoint(1, 300, 300);
+    pincher.handleTouchMove(t.events());
+    assertTrue(pincher.status().clampedScale > 1.1 * oldState.clampedScale);
+    pincher.handleTouchCancel();
+  }
+
   return {
     run: function(){
       testZoomOut();
       testZoomIn();
       testZoomOutAndPan();
       testReversible();
       testMultitouchZoomOut();
       testZoomOutThenMulti();
       testCancel();
       testSingularity();
       testMinSpan();
+      testFontScaling();
       pincher.reset();
 
       return {success: true};
     }
   };
 }());