Revert of Remove V8RecrusionScope, cleanup call sites.

third_party/WebKit/Source/platform/v8_inspector/V8Regex.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/v8_inspector/V8Regex.h"
 
 #include "platform/v8_inspector/V8DebuggerImpl.h"
 #include "platform/v8_inspector/V8StringUtil.h"
 #include "platform/v8_inspector/public/V8DebuggerClient.h"
 
@@ skipping 27 matching lines @@
     if (m_regex.IsEmpty() || string.isEmpty())
         return -1;
 
     // v8 strings are limited to int.
     if (string.length() > INT_MAX)
         return -1;
 
     v8::Isolate* isolate = m_debugger->isolate();
     v8::HandleScope handleScope(isolate);
     v8::Local<v8::Context> context = m_debugger->regexContext();
+    v8::Context::Scope contextScope(context);
     v8::TryCatch tryCatch(isolate);
 
     v8::Local<v8::RegExp> regex = m_regex.Get(isolate);
     v8::Local<v8::Value> exec;
     if (!regex->Get(context, toV8StringInternalized(isolate, "exec")).ToLocal(&exec))
         return -1;
     v8::Local<v8::Value> argv[] = { toV8String(isolate, string.substring(startFrom)) };
     v8::Local<v8::Value> returnValue;
-    if (!exec.As<v8::Function>()->Call(context, regex, WTF_ARRAY_LENGTH(argv), argv).ToLocal(&returnValue))
+    if (!m_debugger->client()->callInternalFunction(exec.As<v8::Function>(), regex, WTF_ARRAY_LENGTH(argv), argv).ToLocal(&returnValue))
         return -1;
 
     // RegExp#exec returns null if there's no match, otherwise it returns an
     // Array of strings with the first being the whole match string and others
     // being subgroups. The Array also has some random properties tacked on like
     // "index" which is the offset of the match.
     //
     // https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec
 
     ASSERT(!returnValue.IsEmpty());
     if (!returnValue->IsArray())
         return -1;
 
     v8::Local<v8::Array> result = returnValue.As<v8::Array>();
     v8::Local<v8::Value> matchOffset;
     if (!result->Get(context, toV8StringInternalized(isolate, "index")).ToLocal(&matchOffset))
         return -1;
     if (matchLength) {
         v8::Local<v8::Value> match;
         if (!result->Get(context, 0).ToLocal(&match))
             return -1;
         *matchLength = match.As<v8::String>()->Length();
     }
 
     return matchOffset.As<v8::Int32>()->Value() + startFrom;
 }
 
 } // namespace blink