ShapeDetection: Holding all of mock service to prevent GC

third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js

 "use strict";
 
 let mockFaceDetectionProviderReady = define(
   'mockFaceDetectionProvider',
   ['services/shape_detection/public/interfaces/facedetection.mojom',
    'services/shape_detection/public/interfaces/facedetection_provider.mojom',
    'mojo/public/js/bindings',
    'mojo/public/js/core',
    'content/public/renderer/interfaces',
   ], (faceDetection, faceDetectionProvider, bindings, mojo, interfaces) => {
 
   class MockFaceDetectionProvider {
     constructor() {
       this.bindingSet_ = new bindings.BindingSet(
           faceDetectionProvider.FaceDetectionProvider);
 
       interfaces.addInterfaceOverrideForTesting(
           faceDetectionProvider.FaceDetectionProvider.name,
           handle => this.bindingSet_.addBinding(this, handle));
     }
 
     createFaceDetection(request, options) {
       this.mock_service_ = new MockFaceDetection(request, options);

[Ken Rockot(use gerrit already), 2017/05/29 06:12:54]

nit: mockService_?

     }
 
     getFrameData() {
-      return this.mock_service_.buffer_data_;
+      return this.mock_service_.bufferData_;
     }
 
     getMaxDetectedFaces() {
      return this.mock_service_.maxDetectedFaces_;
     }
 
     getFastMode () {
       return this.mock_service_.fastMode_;
     }
   }
 
   class MockFaceDetection {
     constructor(request, options) {
       this.maxDetectedFaces_ = options.max_detected_faces;
       this.fastMode_ = options.fast_mode;
       this.binding_ = new bindings.Binding(faceDetection.FaceDetection, this,
                                            request);
     }
 
     detect(frame_data, width, height) {
       let receivedStruct = mojo.mapBuffer(frame_data, 0, width*height*4, 0);
-      this.buffer_data_ = new Uint32Array(receivedStruct.buffer);
+      this.bufferData_ = new Uint32Array(receivedStruct.buffer);
       return Promise.resolve({
         result: {
           bounding_boxes: [
             { x : 1.0, y: 1.0, width: 100.0, height: 100.0 },
             { x : 2.0, y: 2.0, width: 200.0, height: 200.0 },
             { x : 3.0, y: 3.0, width: 300.0, height: 300.0 },
           ]
         }
       });
       mojo.unmapBuffer(receivedStruct.buffer);
     }
   }
   return new MockFaceDetectionProvider();
 });