Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

tests/ProbeChild.sys.mjs

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+// Test-only actor, registered by tools/inspect-host.py through Marionette.
+export class VulpesProbeChild extends JSWindowActorChild {
+  async receiveMessage(message) {
+    if (message.name === 'Tap') {
+      const {x,y}=message.data, win=this.contentWindow;
+      if (!Number.isFinite(x) || !Number.isFinite(y) || x<0 || y<0 ||
+          x>=win.innerWidth || y>=win.innerHeight) throw Error('INVALID_TEST_POINT');
+      const points=[{identifier:0,offsetX:x,offsetY:y,radiiX:1,radiiY:1}];
+      win.synthesizeTouchEvent('touchstart',points,0,{isAsyncEnabled:false});
+      const {setTimeout}=ChromeUtils.importESModule('resource://gre/modules/Timer.sys.mjs');
+      await new Promise(resolve=>setTimeout(resolve,80));
+      win.synthesizeTouchEvent('touchend',points,0,{isAsyncEnabled:false});
+      return true;
+    }
+    if (message.name === 'RenderedFonts') {
+      const document = this.contentWindow.document;
+      await document.fonts.ready;
+      const result = [];
+      function collect(root) {
+        const range = document.createRange();
+        range.selectNodeContents(root);
+        for (const face of InspectorUtils.getUsedFontFaces(range, 3, true)) {
+          result.push({
+            scope: root.host?.tagName || 'document',
+            name: face.name,
+            family: face.CSSFamilyName,
+            generic: face.CSSGeneric,
+            uri: face.URI,
+            fallback: face.fromSystemFallback,
+            samples: face.ranges.map(r => r.toString().slice(0, 80)),
+          });
+        }
+        for (const node of root.querySelectorAll('*')) {
+          if (node.shadowRoot) collect(node.shadowRoot);
+        }
+      }
+      collect(document.body);
+      return result;
+    }
+    if (message.name === 'TouchState') {
+      const actor = this.manager.getActor('VulpesTouch');
+      return {
+        top: this.browsingContext.top.id,
+        contexts: Services.cpmm.sharedData.get('vulpes:host-contexts'),
+        enabled: actor.simulator?.enabled,
+        native: Services.cpmm.sharedData.get('vulpes:native-touch') === true,
+        input:Services.cpmm.sharedData.get('vulpes:native-input'),
+      };
+    }
+    if (message.name !== 'Evaluate') throw new Error('Unknown probe command');
+    const sandbox = Cu.Sandbox(this.contentWindow, {
+      sandboxPrototype: this.contentWindow,
+      wantXrays: false,
+    });
+    return await Cu.evalInSandbox('(async () => {' + message.data + '})()', sandbox);
+  }
+}