Do not log Extensions.InjectedScriptExecutionTime histograms if script not executed

extensions/renderer/script_injection.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_
 #define EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/optional.h"
 #include "extensions/common/user_script.h"
 #include "extensions/renderer/injection_host.h"
 #include "extensions/renderer/script_injector.h"
 
 struct HostID;
 
 namespace content {
 class RenderFrame;
 }
 
@@ skipping 51 matching lines @@
   // Resets the pointer of the injection host when the host is gone.
   void OnHostRemoved();
 
   void invalidate_render_frame() { render_frame_ = nullptr; }
 
   // Accessors.
   content::RenderFrame* render_frame() const { return render_frame_; }
   const HostID& host_id() const { return injection_host_->id(); }
   int64_t request_id() const { return request_id_; }
 
-  // Called when JS injection for the given frame has been completed.
+  // Called when JS injection for the given frame has been completed or
+  // cancelled.
   void OnJsInjectionCompleted(const std::vector<v8::Local<v8::Value>>& results,
-                              base::TimeDelta elapsed);
+                              base::Optional<base::TimeDelta> elapsed);
 
  private:
   class FrameWatcher;
 
   // Sends a message to the browser to request permission to inject.
   void RequestPermissionFromBrowser();
 
   // Injects the script. Returns INJECTION_FINISHED if injection has finished,
   // otherwise INJECTION_BLOCKED.
   InjectionResult Inject(ScriptsRunInfo* scripts_run_info);
@@ skipping 45 matching lines @@
   std::unique_ptr<FrameWatcher> frame_watcher_;
 
   base::WeakPtrFactory<ScriptInjection> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptInjection);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_