Add api logging for SBDebugger::SetCurrentPlatformSDKRoot.
<rdar://problem/27857025> 

llvm-svn: 279611
diff --git a/lldb/source/API/SBDebugger.cpp b/lldb/source/API/SBDebugger.cpp
index cc55230..9a04708 100644
--- a/lldb/source/API/SBDebugger.cpp
+++ b/lldb/source/API/SBDebugger.cpp
@@ -1228,12 +1228,15 @@
 bool
 SBDebugger::SetCurrentPlatformSDKRoot (const char *sysroot)
 {
+    Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
     if (m_opaque_sp)
     {
         PlatformSP platform_sp (m_opaque_sp->GetPlatformList().GetSelectedPlatform());
         
         if (platform_sp)
         {
+            if (log && sysroot)
+                log->Printf ("SBDebugger::SetCurrentPlatformSDKRoot (\"%s\")", sysroot);
             platform_sp->SetSDKRootDirectory (ConstString (sysroot));
             return true;
         }