Fix the WebGL memory leak for Blur effect in Chrome 77 and up (#4652)

package-lock.json

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package.json

     "@react-native-community/async-storage": "1.3.4",
     "@react-native-community/netinfo": "4.1.5",
     "@svgr/webpack": "4.3.2",
-    "@tensorflow-models/body-pix": "^1.0.1",
-    "@tensorflow/tfjs": "^1.1.2",
+    "@tensorflow-models/body-pix": "1.1.2",
+    "@tensorflow/tfjs": "1.2.9",
     "@webcomponents/url": "0.7.1",
     "amplitude-js": "4.5.2",
     "bc-css-flags": "3.0.0",

react/features/stream-effects/blur/JitsiStreamBlurEffect.js

         });
         this._maskFrameTimerWorker.postMessage({
             id: SET_INTERVAL,
-            timeMs: 200
+            timeMs: 50
         });
 
         return this._outputCanvasElement.captureStream(this._frameRate);
                 7, // Constant for background blur, integer values between 0-20
                 7 // Constant for edge blur, integer values between 0-20
             );
+
+            // Make sure we clear this buffer before feeding the segmentation data
+            // to drawBokehEffect for creating the blur. This fixes the memory leak
+            // that started happening in WebGL in Chrome 77 and up.
+            this._segmentationData = null;
         }
     }
 

react/features/stream-effects/blur/index.js

 // @flow
 
 import { load } from '@tensorflow-models/body-pix';
-
+import * as tfc from '@tensorflow/tfjs-core';
 import JitsiStreamBlurEffect from './JitsiStreamBlurEffect';
 
 /**
  */
 const bpModelPromise = load(0.25);
 
+/**
+ * Configure the Tensor Flow model to use the webgl backend which is the
+ * most powerful backend for the browser.
+ */
+const webGlBackend = 'webgl';
+
 /**
  * Creates a new instance of JitsiStreamBlurEffect.
  *
         return Promise.reject(new Error('JitsiStreamBlurEffect not supported!'));
     }
 
-    return bpModelPromise.then(bpmodel => new JitsiStreamBlurEffect(bpmodel));
+    const setBackendPromise = new Promise((resolve, reject) => {
+        if (tfc.getBackend() === webGlBackend) {
+            resolve();
+
+            return;
+        }
+
+        return tfc.setBackend(webGlBackend)
+            .then(resolve, reject);
+    });
+
+    return setBackendPromise
+        .then(() => bpModelPromise)
+        .then(bpmodel => new JitsiStreamBlurEffect(bpmodel));
 }