Fix error in opencensus to stackdriver translation (#474) (#475)

- compressedSize -> compressedSizeBytes
  - uncompressedSize -> uncompressedSizeBytes

Author: jinmel

packages/opencensus-exporter-stackdriver/src/stackdriver-cloudtrace-utils.ts

@@ -84,8 +84,8 @@ export function createTimeEvents(
           messageEvent: {
             id: String(messageEvent.id),
             type: createMessageEventType(messageEvent.type),
-            uncompressedSize: String(messageEvent.uncompressedSize || 0),
-            compressedSize: String(messageEvent.compressedSize || 0)
+            uncompressedSizeBytes: String(messageEvent.uncompressedSize || 0),
+            compressedSizeBytes: String(messageEvent.compressedSize || 0)
           }
         })));
   }

packages/opencensus-exporter-stackdriver/test/test-stackdriver-cloudtrace-utils.ts

@@ -144,18 +144,30 @@ describe('Stackdriver CloudTrace Exporter Utils', () => {
         }
       },
       {
-        messageEvent:
-            {compressedSize: '100', id: '1', type: 1, uncompressedSize: '12'},
+        messageEvent: {
+          compressedSizeBytes: '100',
+          id: '1',
+          type: 1,
+          uncompressedSizeBytes: '12'
+        },
         time: '1970-01-02T10:17:36.789Z',
       },
       {
-        messageEvent:
-            {compressedSize: '0', id: '1', type: 2, uncompressedSize: '0'},
+        messageEvent: {
+          compressedSizeBytes: '0',
+          id: '1',
+          type: 2,
+          uncompressedSizeBytes: '0'
+        },
         time: '1970-01-02T10:17:36.789Z',
       },
       {
-        messageEvent:
-            {compressedSize: '0', id: '1', type: 0, uncompressedSize: '0'},
+        messageEvent: {
+          compressedSizeBytes: '0',
+          id: '1',
+          type: 0,
+          uncompressedSizeBytes: '0'
+        },
         time: '1970-01-02T10:17:36.789Z',
       }
     ];