Make disk cache inspection toggleable

Summary: Adds a toggle switch to show/hide disk cache images defaulting to inactive. The image data is only sent on the adb connection when the toggle is activated.

Reviewed By: defHLT

Differential Revision: D20002059

fbshipit-source-id: 05c9e515ffe09441e5cfb6f66eb14559ac4a322c

desktop/plugins/fresco/ImagesCacheOverview.tsx

@@ -87,6 +87,8 @@ type ImagesCacheOverviewProps = {
   events: Array<ImageEventWithId>;
   onTrackLeaks: (enabled: boolean) => void;
   isLeakTrackingEnabled: boolean;
+  onShowDiskImages: (enabled: boolean) => void;
+  showDiskImages: boolean;
 };
 
 type ImagesCacheOverviewState = {
@@ -231,6 +233,11 @@ export default class ImagesCacheOverview extends PureComponent<
             onClick={this.props.onTrackLeaks}
             label="Track Leaks"
           />
+          <Toggle
+            toggled={this.props.showDiskImages}
+            onClick={this.props.onShowDiskImages}
+            label="Show Disk Images"
+          />
           <Spacer />
           <input
             type="range"