Disable TruncatedTrace unit test in official builds.

base/debug/stack_trace_unittest.cc

 // Copyright (c) 2011 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 <stddef.h>
 
 #include <limits>
 #include <sstream>
 #include <string>
 
@@ skipping 104 matching lines @@
 
   // Expect to find this function as well.
   // Note: This will fail if not linked with -rdynamic (aka -export_dynamic)
   EXPECT_TRUE(backtrace_message.find(__func__) != std::string::npos)
       << "Expected to find " << __func__ << " in backtrace:\n"
       << backtrace_message;
 
 #endif  // define(OS_MACOSX)
 }
 
+#if !defined(OFFICIAL_BUILD)
+// Disabled in Official builds, where Link-Time Optimization can result in two
+// or fewer stack frames being available, causing the test to fail.
 TEST_F(StackTraceTest, TruncatedTrace) {
   StackTrace trace;
 
   size_t count = 0;
   trace.Addresses(&count);
   ASSERT_LT(2u, count);
 
   StackTrace truncated(2);
   truncated.Addresses(&count);
   EXPECT_EQ(2u, count);
 }
+#endif  // !defined(OFFICIAL_BUILD)
 
 // The test is used for manual testing, e.g., to see the raw output.
 TEST_F(StackTraceTest, DebugOutputToStream) {
   StackTrace trace;
   std::ostringstream os;
   trace.OutputToStream(&os);
   VLOG(1) << os.str();
 }
 
 // The test is used for manual testing, e.g., to see the raw output.
@@ skipping 150 matching lines @@
 TEST_F(StackTraceTest, MAYBE_TraceStackFramePointers) {
   constexpr size_t kDepth = 5;
   const void* frames[kDepth];
   ExpectStackFramePointers<kDepth>(frames, kDepth);
 }
 
 #endif  // HAVE_TRACE_STACK_FRAME_POINTERS
 
 }  // namespace debug
 }  // namespace base