test($compile): work around Chrome issue with reported size for <foreignObject>

Since Chrome 53-57+, the reported size of `<foreignObject>` elements and their
descendants is affected by global display settings (e.g. font size) and browser
settings (e.g. default zoom level). This could cause tests incorrectly failing
due to such settings.

In order to avoid false negatives, we now compare against the size of the
equivalent, hand-written SVG instead of fixed widths/heights.

Fixes #15333

Closes #15458

test/ng/compileSpec.js

@@ -442,30 +442,70 @@ describe('$compile', function() {
     }));
 
     if (supportsForeignObject()) {
+      // Supports: Chrome 53-57+
+      // Since Chrome 53-57+, the reported size of `<foreignObject>` elements and their descendants
+      // is affected by global display settings (e.g. font size) and browser settings (e.g. default
+      // zoom level). In order to avoid false negatives, we compare against the size of the
+      // equivalent, hand-written SVG instead of fixed widths/heights.
+      var HAND_WRITTEN_SVG =
+        '<svg width="400" height="400">' +
+          '<foreignObject width="100" height="100">' +
+            '<div style="position:absolute;width:20px;height:20px">test</div>' +
+          '</foreignObject>' +
+        '</svg>';
+
       it('should handle foreignObject', inject(function() {
-        element = jqLite('<div><svg-container>' +
-            '<foreignObject width="100" height="100"><div class="test" style="position:absolute;width:20px;height:20px">test</div></foreignObject>' +
-            '</svg-container></div>');
+        element = jqLite(
+          '<div>' +
+            // By hand (for reference)
+            HAND_WRITTEN_SVG +
+            // By directive
+            '<svg-container>' +
+              '<foreignObject width="100" height="100">' +
+                '<div style="position:absolute;width:20px;height:20px">test</div>' +
+              '</foreignObject>' +
+            '</svg-container>' +
+          '</div>');
         $compile(element.contents())($rootScope);
         document.body.appendChild(element[0]);
 
-        var testElem = element.find('div');
-        expect(isHTMLElement(testElem[0])).toBe(true);
-        var bounds = testElem[0].getBoundingClientRect();
-        expect(bounds.width === 20 && bounds.height === 20).toBe(true);
+        var referenceElem = element.find('div')[0];
+        var testElem = element.find('div')[1];
+        var referenceBounds = referenceElem.getBoundingClientRect();
+        var testBounds = testElem.getBoundingClientRect();
+
+        expect(isHTMLElement(testElem)).toBe(true);
+        expect(referenceBounds.width).toBeGreaterThan(0);
+        expect(referenceBounds.height).toBeGreaterThan(0);
+        expect(testBounds.width).toBe(referenceBounds.width);
+        expect(testBounds.height).toBe(referenceBounds.height);
       }));
 
       it('should handle custom svg containers that transclude to foreignObject that transclude html', inject(function() {
-        element = jqLite('<div><svg-container>' +
-            '<my-foreign-object><div class="test" style="width:20px;height:20px">test</div></my-foreign-object>' +
-            '</svg-container></div>');
+        element = jqLite(
+          '<div>' +
+            // By hand (for reference)
+            HAND_WRITTEN_SVG +
+            // By directive
+            '<svg-container>' +
+              '<my-foreign-object>' +
+                '<div style="width:20px;height:20px">test</div>' +
+              '</my-foreign-object>' +
+            '</svg-container>' +
+          '</div>');
         $compile(element.contents())($rootScope);
         document.body.appendChild(element[0]);
 
-        var testElem = element.find('div');
-        expect(isHTMLElement(testElem[0])).toBe(true);
-        var bounds = testElem[0].getBoundingClientRect();
-        expect(bounds.width === 20 && bounds.height === 20).toBe(true);
+        var referenceElem = element.find('div')[0];
+        var testElem = element.find('div')[1];
+        var referenceBounds = referenceElem.getBoundingClientRect();
+        var testBounds = testElem.getBoundingClientRect();
+
+        expect(isHTMLElement(testElem)).toBe(true);
+        expect(referenceBounds.width).toBeGreaterThan(0);
+        expect(referenceBounds.height).toBeGreaterThan(0);
+        expect(testBounds.width).toBe(referenceBounds.width);
+        expect(testBounds.height).toBe(referenceBounds.height);
       }));
 
       // NOTE: This test may be redundant.