Disable CompositingRenderWidgetHostViewBrowserTestHiDPI.ScrollOffset.

Disable this test as it's flaky on Linux.

Tbr: yiyix@chromium.org, fsamuel@chromium.org
Bug: 828061
Change-Id: Ia890fb9392d2784e4b2c835665cc7a6427b1c0e4
Reviewed-on: https://chromium-review.googlesource.com/995588Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548082}

content/browser/renderer_host/render_widget_host_view_browsertest.cc

@@ -737,8 +737,14 @@ class CompositingRenderWidgetHostViewBrowserTestHiDPI
   DISALLOW_COPY_AND_ASSIGN(CompositingRenderWidgetHostViewBrowserTestHiDPI);
 };
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#define MAYBE_ScrollOffset DISABLED_ScrollOffset
+#else
+#define MAYBE_ScrollOffset ScrollOffset
+#endif
+
 IN_PROC_BROWSER_TEST_P(CompositingRenderWidgetHostViewBrowserTestHiDPI,
-                       ScrollOffset) {
+                       MAYBE_ScrollOffset) {
   const int kContentHeight = 2000;
   const int kScrollAmount = 100;