[debug] change coverage API to use offset instead of line/column.

src/debug/debug-interface.h

 // Copyright 2016 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_DEBUG_DEBUG_INTERFACE_H_
 #define V8_DEBUG_DEBUG_INTERFACE_H_
 
 #include <functional>
 
 #include "include/v8-debug.h"
@@ skipping 200 matching lines @@
 
 /*
  * Provide API layer between inspector and code coverage.
  */
 class V8_EXPORT_PRIVATE Coverage {
  public:
   class ScriptData;  // Forward declaration.
 
   class V8_EXPORT_PRIVATE FunctionData {
    public:
-    // 0-based line and colum numbers.
-    Location Start() { return start_; }
-    Location End() { return end_; }
+    int StartOffset();
+    int EndOffset();
     uint32_t Count();
     MaybeLocal<String> Name();
 
    private:
-    FunctionData(i::CoverageFunction* function, Local<debug::Script> script);
+    explicit FunctionData(i::CoverageFunction* function)
+        : function_(function) {}
     i::CoverageFunction* function_;
-    Location start_;
-    Location end_;
 
     friend class v8::debug::Coverage::ScriptData;
   };
 
   class V8_EXPORT_PRIVATE ScriptData {
    public:
     Local<debug::Script> GetScript();
     size_t FunctionCount();
     FunctionData GetFunctionData(size_t i);
 
@@ skipping 15 matching lines @@
   ~Coverage();
 
  private:
   explicit Coverage(i::Coverage* coverage) : coverage_(coverage) {}
   i::Coverage* coverage_;
 };
 }  // namespace debug
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_INTERFACE_H_