[MemSheriff] Suppress uninit read in clipboard msg for Dr. Memory + msan

content/browser/frame_host/interstitial_page_impl_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/interstitial_page_impl.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/clipboard_messages.h"
@@ skipping 331 matching lines @@
   std::string clipboard_text = PerformCopy();
   EXPECT_EQ("text-to-copy", clipboard_text);
 
   std::string input_text;
   ASSERT_TRUE(GetInputText(&input_text));
   EXPECT_EQ("text-to-copy", input_text);
 
   TearDownInterstitialPage();
 }
 
-IN_PROC_BROWSER_TEST_F(InterstitialPageImplTest, Paste) {
+// Failing on msan bot: crbug.com/506921
+#if defined(MEMORY_SANITIZER)
+#define MAYBE_Paste DISABLED_Paste
+#else
+#define MAYBE_Paste Paste
+#endif
+
+IN_PROC_BROWSER_TEST_F(InterstitialPageImplTest, MAYBE_Paste) {
   SetUpTestClipboard();
   SetUpInterstitialPage();
 
   SetClipboardText("text-to-paste");
 
   ASSERT_TRUE(SetInputText(std::string()));
   ASSERT_TRUE(FocusInputAndSelectText());
 
   PerformPaste();
 
   std::string input_text;
   ASSERT_TRUE(GetInputText(&input_text));
   EXPECT_EQ("text-to-paste", input_text);
 
   TearDownInterstitialPage();
   TearDownTestClipboard();
 }
 
 }  // namespace content