[debug] refactor code coverage to use enum for mode.

test/cctest/test-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6595 matching lines @@
     CHECK(out_of_memory_callback_called);
   }
   isolate->Dispose();
 }
 
 TEST(DebugCoverage) {
   i::FLAG_always_opt = false;
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();
   v8::HandleScope scope(isolate);
-  v8::debug::Coverage::TogglePrecise(isolate, true);
+  v8::debug::Coverage::SelectMode(isolate, v8::debug::Coverage::kPreciseCount);
   v8::Local<v8::String> source = v8_str(
       "function f() {\n"
       "}\n"
       "f();\n"
       "f();");
   CompileRun(source);
   v8::debug::Coverage coverage = v8::debug::Coverage::Collect(isolate, false);
   CHECK_EQ(1u, coverage.ScriptCount());
   v8::debug::Coverage::ScriptData script_data = coverage.GetScriptData(0);
   v8::Local<v8::debug::Script> script = script_data.GetScript();
@@ skipping 45 matching lines @@
     if (builtin->is_promise_rejection() || builtin->is_exception_caught())
       continue;
 
     if (whitelist.find(i) != whitelist.end()) continue;
 
     fail = true;
     i::PrintF("%s is missing exception predictions.\n", builtins->name(i));
   }
   CHECK(!fail);
 }