[debugger] implement per-function code coverage.

src/runtime/runtime.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include <memory>
 
 #include "src/allocation.h"
@@ skipping 184 matching lines @@
   F(ScriptSourceLine, 2, 1)                     \
   F(DebugOnFunctionCall, 1, 1)                  \
   F(DebugPrepareStepInSuspendedGenerator, 0, 1) \
   F(DebugRecordGenerator, 1, 1)                 \
   F(DebugPushPromise, 1, 1)                     \
   F(DebugPopPromise, 0, 1)                      \
   F(DebugPromiseReject, 2, 1)                   \
   F(DebugAsyncEventEnqueueRecurring, 2, 1)      \
   F(DebugAsyncFunctionPromiseCreated, 1, 1)     \
   F(DebugIsActive, 0, 1)                        \
-  F(DebugBreakInOptimizedCode, 0, 1)
+  F(DebugBreakInOptimizedCode, 0, 1)            \
+  F(DebugCollectCoverage, 0, 1)
 
 #define FOR_EACH_INTRINSIC_ERROR(F) F(ErrorToString, 1, 1)
 
 #define FOR_EACH_INTRINSIC_FORIN(F) \
   F(ForInEnumerate, 1, 1)           \
   F(ForInFilter, 2, 1)              \
   F(ForInHasProperty, 2, 1)
 
 #define FOR_EACH_INTRINSIC_INTERPRETER(F) \
   F(InterpreterNewClosure, 4, 1)          \
@@ skipping 948 matching lines @@
   kMaybeDeopted = 1 << 3,
   kOptimized = 1 << 4,
   kTurboFanned = 1 << 5,
   kInterpreted = 1 << 6,
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_