perf: cache browser plugin sdk facades

src/plugin-activation-boundary.test.ts

@@ -227,14 +227,7 @@ describe("plugin activation boundary", () => {
       loadBundledPluginPublicSurfaceModuleSync.mock.calls.map(
         ([params]) => params.artifactBasename,
       ),
-    ).toEqual([
-      "browser-host-inspection.js",
-      "browser-control-auth.js",
-      "browser-profiles.js",
-      "browser-profiles.js",
-      "browser-host-inspection.js",
-      "browser-host-inspection.js",
-    ]);
+    ).toEqual(["browser-host-inspection.js", "browser-control-auth.js", "browser-profiles.js"]);
 
     loadBundledPluginPublicSurfaceModuleSync.mockReset();
     await expect(browser.closeTrackedBrowserTabsForSessions({ sessionKeys: [] })).resolves.toBe(0);

src/plugin-sdk/browser-control-auth.ts

@@ -24,11 +24,15 @@ type BrowserControlAuthSurface = {
   ) => Promise<EnsureBrowserControlAuthResult>;
 };
 
+let cachedBrowserControlAuthSurface: BrowserControlAuthSurface | undefined;
+
 function loadBrowserControlAuthSurface(): BrowserControlAuthSurface {
-  return loadBundledPluginPublicSurfaceModuleSync<BrowserControlAuthSurface>({
-    dirName: "browser",
-    artifactBasename: "browser-control-auth.js",
-  });
+  cachedBrowserControlAuthSurface ??=
+    loadBundledPluginPublicSurfaceModuleSync<BrowserControlAuthSurface>({
+      dirName: "browser",
+      artifactBasename: "browser-control-auth.js",
+    });
+  return cachedBrowserControlAuthSurface;
 }
 
 export function resolveBrowserControlAuth(

src/plugin-sdk/browser-host-inspection.ts

@@ -11,11 +11,15 @@ type BrowserHostInspectionSurface = {
   parseBrowserMajorVersion: (rawVersion: string | null | undefined) => number | null;
 };
 
+let cachedBrowserHostInspectionSurface: BrowserHostInspectionSurface | undefined;
+
 function loadBrowserHostInspectionSurface(): BrowserHostInspectionSurface {
-  return loadBundledPluginPublicSurfaceModuleSync<BrowserHostInspectionSurface>({
-    dirName: "browser",
-    artifactBasename: "browser-host-inspection.js",
-  });
+  cachedBrowserHostInspectionSurface ??=
+    loadBundledPluginPublicSurfaceModuleSync<BrowserHostInspectionSurface>({
+      dirName: "browser",
+      artifactBasename: "browser-host-inspection.js",
+    });
+  return cachedBrowserHostInspectionSurface;
 }
 
 export function resolveGoogleChromeExecutableForPlatform(

src/plugin-sdk/browser-maintenance.ts

@@ -10,15 +10,19 @@ type BrowserMaintenanceSurface = {
   closeTrackedBrowserTabsForSessions: (params: CloseTrackedBrowserTabsParams) => Promise<number>;
 };
 
+let cachedBrowserMaintenanceSurface: BrowserMaintenanceSurface | undefined;
+
 function hasRequestedSessionKeys(sessionKeys: Array<string | undefined>): boolean {
   return sessionKeys.some((key) => Boolean(key?.trim()));
 }
 
 function loadBrowserMaintenanceSurface(): BrowserMaintenanceSurface {
-  return loadBundledPluginPublicSurfaceModuleSync<BrowserMaintenanceSurface>({
-    dirName: "browser",
-    artifactBasename: "browser-maintenance.js",
-  });
+  cachedBrowserMaintenanceSurface ??=
+    loadBundledPluginPublicSurfaceModuleSync<BrowserMaintenanceSurface>({
+      dirName: "browser",
+      artifactBasename: "browser-maintenance.js",
+    });
+  return cachedBrowserMaintenanceSurface;
 }
 
 export async function closeTrackedBrowserTabsForSessions(

src/plugin-sdk/browser-profiles.ts

@@ -57,11 +57,16 @@ type BrowserProfilesSurface = {
   ) => ResolvedBrowserProfile | null;
 };
 
+let cachedBrowserProfilesSurface: BrowserProfilesSurface | undefined;
+
 function loadBrowserProfilesSurface(): BrowserProfilesSurface {
-  return loadBundledPluginPublicSurfaceModuleSync<BrowserProfilesSurface>({
-    dirName: "browser",
-    artifactBasename: "browser-profiles.js",
-  });
+  cachedBrowserProfilesSurface ??= loadBundledPluginPublicSurfaceModuleSync<BrowserProfilesSurface>(
+    {
+      dirName: "browser",
+      artifactBasename: "browser-profiles.js",
+    },
+  );
+  return cachedBrowserProfilesSurface;
 }
 
 export function resolveBrowserConfig(