[inspector] added inspector test runner [part 3]

test/inspector-protocol/inspector-impl.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_TEST_INSPECTOR_PROTOCOL_INSPECTOR_IMPL_H_
 #define V8_TEST_INSPECTOR_PROTOCOL_INSPECTOR_IMPL_H_
 
 #include "include/v8-inspector.h"
 #include "include/v8.h"
 #include "src/base/macros.h"
 #include "src/base/platform/platform.h"
 #include "test/inspector-protocol/task-runner.h"
 
 class InspectorClientImpl : public v8_inspector::V8InspectorClient {
  public:
   class FrontendChannel {
    public:
     virtual ~FrontendChannel() {}
     virtual void SendMessageToFrontend(
         const v8_inspector::StringView& message) = 0;
   };
 
   InspectorClientImpl(TaskRunner* task_runner,
                       FrontendChannel* frontend_channel,
                       v8::base::Semaphore* ready_semaphore);
   virtual ~InspectorClientImpl();
 
+  static v8_inspector::V8Inspector* InspectorFromContext(
+      v8::Local<v8::Context> context);
+
  private:
   // V8InspectorClient implementation.
   v8::Local<v8::Context> ensureDefaultContextInGroup(int) override;
   double currentTimeMS() override;
   void runMessageLoopOnPause(int) override;
   void quitMessageLoopOnPause() override;
 
   static v8_inspector::V8InspectorSession* SessionFromContext(
       v8::Local<v8::Context> context);
 
@@ skipping 28 matching lines @@
   }
 
  private:
   static void SendMessageToBackend(
       const v8::FunctionCallbackInfo<v8::Value>& args);
 
   static TaskRunner* backend_task_runner_;
 };
 
 #endif  //  V8_TEST_INSPECTOR_PROTOCOL_INSPECTOR_IMPL_H_