Disable VisualPropertiesPropagation_DisplayMode

Disable RenderWidgetHostViewChildFrameBrowserTest.
VisualPropertiesPropagation_DisplayMode on Mac and Linux due to flaky.

Bug: 1126153
Tbr: kenrb@chromium.org
Change-Id: If31a8b4ede074539f250b2869307e36add8b4c1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399302Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805058}

content/browser/renderer_host/render_widget_host_view_child_frame_browsertest.cc

@@ -428,8 +428,16 @@ class DisplayModeControllingWebContentsDelegate : public WebContentsDelegate {
 // TODO(crbug.com/1060336): Unlike most VisualProperties, the DisplayMode does
 // not propagate down the tree of RenderWidgets, but is sent independently to
 // each RenderWidget.
+// Disable the test due to flaky, https://crbug.com/1126153
+#if defined(OS_MAC) || defined(OS_LINUX)
+#define MAYBE_VisualPropertiesPropagation_DisplayMode \
+  DISABLED_VisualPropertiesPropagation_DisplayMode
+#else
+#define MAYBE_VisualPropertiesPropagation_DisplayMode \
+  VisualPropertiesPropagation_DisplayMode
+#endif
 IN_PROC_BROWSER_TEST_F(RenderWidgetHostViewChildFrameBrowserTest,
-                       VisualPropertiesPropagation_DisplayMode) {
+                       MAYBE_VisualPropertiesPropagation_DisplayMode) {
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(a,b)"));
   EXPECT_TRUE(NavigateToURL(shell(), main_url));