Re-enable SnapshotBrowserTest.AsyncMultiWindowTest on Linux

This change re-enables the SnapshotBrowserTest.AsyncMultiWindowTest on Linux.

While adding an early exit for variants running Vulkan. We currently lack a way
to mark gtests as expecting to fail for certain flag variants.

This will enable us to maintain coverage on Linux, while we separately
investigate the root cause on Vulkan.

TBR=kbr@chromium.org, jam@chromium.org

TEST: SnapshotBrowserTest.AsyncMultiWindowTest
Bug: 1003176, 1003375
Change-Id: I290f812546a9d1d02dceea40966b29f616562fc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1801053Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696055}

content/browser/snapshot_browsertest.cc

@@ -24,6 +24,7 @@
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/shell/common/shell_switches.h"
+#include "gpu/command_buffer/service/gpu_switches.h"
 #include "net/test/embedded_test_server/http_request.h"
 #include "net/test/embedded_test_server/http_response.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ -255,8 +256,7 @@ IN_PROC_BROWSER_TEST_F(SnapshotBrowserTest, SingleWindowTest) {
 //   Linux TSAN Tests
 //   Linux FYI SkiaRenderer Vulkan (Intel HD 630)
 // See crbug.com/771119
-#if (defined(OS_WIN) && !defined(NDEBUG)) || (defined(OS_CHROMEOS)) || \
-    defined(OS_LINUX)
+#if (defined(OS_WIN) && !defined(NDEBUG)) || (defined(OS_CHROMEOS))
 #define MAYBE_SyncMultiWindowTest DISABLED_SyncMultiWindowTest
 #define MAYBE_AsyncMultiWindowTest DISABLED_AsyncMultiWindowTest
 #else
@@ -320,6 +320,13 @@ IN_PROC_BROWSER_TEST_F(SnapshotBrowserTest, MAYBE_SyncMultiWindowTest) {
 }
 
 IN_PROC_BROWSER_TEST_F(SnapshotBrowserTest, MAYBE_AsyncMultiWindowTest) {
+  // TODO(jonross): Re-enable this once the root cause of the failure has been
+  // fixed. https://crbug.com/1003375
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kUseVulkan))
+    return;
+
   SetupTestServer();
 
   for (int i = 0; i < 3; ++i) {