Temporarily skip tests that consistently fail on Linux MSan.

This seems an issue with recently updated MSan prebuilt libraries,
or at least the issue started to happen after that. While investigating
let's skip the two tests to unblock presubmit and LKGR.

Bug: webrtc:12950
Change-Id: Iebd391deb9f669f6471bd41aae1ab32b7f6f8fc5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/225420
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34434}
diff --git a/modules/desktop_capture/screen_capturer_unittest.cc b/modules/desktop_capture/screen_capturer_unittest.cc
index ea77069..ba6b8bf 100644
--- a/modules/desktop_capture/screen_capturer_unittest.cc
+++ b/modules/desktop_capture/screen_capturer_unittest.cc
@@ -99,7 +99,13 @@
   *dest = std::move(*arg1);
 }
 
-TEST_F(ScreenCapturerTest, GetScreenListAndSelectScreen) {
+// TODO(bugs.webrtc.org/12950): Re-enable when libc++ issue is fixed.
+#if defined(WEBRTC_LINUX) && defined(MEMORY_SANITIZER)
+#define MAYBE_GetScreenListAndSelectScreen DISABLED_GetScreenListAndSelectScreen
+#else
+#define MAYBE_GetScreenListAndSelectScreen GetScreenListAndSelectScreen
+#endif
+TEST_F(ScreenCapturerTest, MAYBE_GetScreenListAndSelectScreen) {
   webrtc::DesktopCapturer::SourceList screens;
   EXPECT_TRUE(capturer_->GetSourceList(&screens));
   for (const auto& screen : screens) {
diff --git a/modules/desktop_capture/window_capturer_unittest.cc b/modules/desktop_capture/window_capturer_unittest.cc
index 3989c28..519c046 100644
--- a/modules/desktop_capture/window_capturer_unittest.cc
+++ b/modules/desktop_capture/window_capturer_unittest.cc
@@ -44,7 +44,13 @@
 };
 
 // Verify that we can enumerate windows.
-TEST_F(WindowCapturerTest, Enumerate) {
+// TODO(bugs.webrtc.org/12950): Re-enable when libc++ issue is fixed
+#if defined(WEBRTC_LINUX) && defined(MEMORY_SANITIZER)
+#define MAYBE_Enumerate DISABLED_Enumerate
+#else
+#define MAYBE_Enumerate Enumerate
+#endif
+TEST_F(WindowCapturerTest, MAYBE_Enumerate) {
   DesktopCapturer::SourceList sources;
   EXPECT_TRUE(capturer_->GetSourceList(&sources));