Function profile should respect --show-invisible-frames

This also improves the function profile by filtering out invisible frames.

BUG=
R=rmacnak@google.com

Review URL: https://codereview.chromium.org/1826743002 .

runtime/vm/profiler_service.cc

@@ -18,6 +18,7 @@ namespace dart {
 
 DECLARE_FLAG(int, max_profile_depth);
 DECLARE_FLAG(int, profile_period);
+DECLARE_FLAG(bool, show_invisible_frames);
 
 #ifndef PRODUCT
 
@@ -136,6 +137,15 @@ const char* ProfileFunction::Name() const {
 }
 
 
+bool ProfileFunction::is_visible() const {
+  if (function_.IsNull()) {
+    // Some synthetic function.
+    return true;
+  }
+  return FLAG_show_invisible_frames || function_.is_visible();
+}
+
+
 void ProfileFunction::Tick(bool exclusive,
                            intptr_t inclusive_serial,
                            TokenPosition token_position) {
@@ -1624,6 +1634,9 @@ class ProfileBuilder : public ValueObject {
                                            ProfileFunction* function,
                                            TokenPosition token_position,
                                            intptr_t code_index) {
+    if (!function->is_visible()) {
+      return current;
+    }
     if (tick_functions_) {
       if (FLAG_trace_profiler_verbose) {
         THR_Print("S[%" Pd "]F[%" Pd "] %s %s 0x%" Px "\n",

runtime/vm/profiler_service.h

@@ -77,6 +77,8 @@ class ProfileFunction : public ZoneAllocated {
     return &function_;
   }
 
+  bool is_visible() const;
+
   intptr_t table_index() const {
     return table_index_;
   }