Initial implementation of GetStackSample sampling profiler API.

test/cctest/cctest.status

Index: test/cctest/cctest.status
diff --git a/test/cctest/cctest.status b/test/cctest/cctest.status
index 5198af6ff5ece7c4fccd3b1a48dfb37cb52278f7..e5a856586f3533510636e59e98bbb0710d5ddf1f 100644
--- a/test/cctest/cctest.status
+++ b/test/cctest/cctest.status
@@ -253,6 +253,10 @@
   'test-debug/DebugGetLoadedScripts': [PASS, FLAKY],
   'test-debug/DebugStepLinear': [PASS, FLAKY],
   'test-debug/DebuggerClearMessageHandler': [PASS, FLAKY],
+
+  # TODO(alph): add support for MacOS.
+  'test-sampler-api/*': [SKIP],
+
 }],  # 'system == macos'
 
 ##############################################################################
@@ -340,6 +344,11 @@
 
   # This test times out.
   'test-threads/ThreadJoinSelf': [SKIP],
+
+  # TODO(alph): Android doesn't seem to support getcontext, so disable the test.
+  # The test could be implemented with POSIX signals.
+  'test-sampler-api/*': [SKIP],
+
 }],  # 'arch == android_arm or arch == android_ia32'
 
 ##############################################################################