Support fractional desktopScale values in choosePluginDimensions.

remoting/webapp/base/js/viewport_unittest.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.
 
 (function() {
 
 'use strict';
 
 /**
  * @param {number} width
@@ skipping 308 matching lines @@
     assert.deepEqual(pluginSize, size(640, 2 * 480));
 
     // 8. Client & host per-monitor dimensions match, two monitors stacked,
     //    high-DPI client & host.
     pluginSize = remoting.Viewport.choosePluginSize(
         size(640, 480), 2.0, size(640, 2 * 480), dpi(192, 192),
         1.0, true, true);
     assert.deepEqual(pluginSize, size(640 / 2.0, (2 * 480) / 2.0));
 });
 
+QUnit.test('choosePluginSize() handling of desktopScale',
+  function(assert) {
+    // 1. Verify that a high-DPI client correctly up-scales the host to account
+    //    for desktopScale.
+    var pluginSize = remoting.Viewport.choosePluginSize(
+        size(640, 480), 2.0, size(1.5 * 640, 1.5 * 480), dpi(96, 96), 1.5,
+        true, true);
+    assert.deepEqual(pluginSize, size(640, 480));
+
+    // 2. Verify that a high-DPI client correctly up-scales the host to fit
+    //    if desktopScale would make it larger, but shrink-to-fit is set.
+    pluginSize = remoting.Viewport.choosePluginSize(
+        size(640, 480), 2.0, size(1280, 900), dpi(96, 96), 1.5,
+        true, true);
+    assert.deepEqual(pluginSize, size(640, 900 * (640 / 1280)));
+
+    // 3. Verify that a high-DPI client correctly up-scales the host based on
+    //    desktopScale and shrink-to-fit is not set.
+    pluginSize = remoting.Viewport.choosePluginSize(
+        size(640, 480), 2.0, size(1280, 900), dpi(96, 96), 1.5,
+        true, false);
+    assert.deepEqual(pluginSize, size(1.5 * 1280, 1.5 * 900));
+});
+
 })();