🙅 Bind a WebAPK to its "host" browser.

web_apks/minting_example/libs/common/org/chromium/minting/lib/common/WebAPKUtils.java

Index: web_apks/minting_example/libs/common/org/chromium/minting/lib/common/WebAPKUtils.java
diff --git a/web_apks/minting_example/libs/common/org/chromium/minting/lib/common/WebAPKUtils.java b/web_apks/minting_example/libs/common/org/chromium/minting/lib/common/WebAPKUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..c8b407954b7d62206d9fd9488bb98dfb9c9a5cc0
--- /dev/null
+++ b/web_apks/minting_example/libs/common/org/chromium/minting/lib/common/WebAPKUtils.java
@@ -0,0 +1,58 @@
+package org.chromium.minting.lib.common;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.os.Bundle;
+
+/**
+ * Contains utility methods for interacting with WebApks.
+ */
+public class WebAPKUtils {
+
+    private static final String DEFAULT_CHROME_PACKAGE_NAME = "com.google.android.apps.chrome";
+
+    /**
+     * Caches the value read from Application Metadata which specifies the host browser's package
+     * name.
+     */
+    private static String sHostPackage;
+
+    /**
+     * Returns a Context for the host browser that was specified when building the WebAPK.
+     * @param context A context.
+     * @return The remote context. Returns null on an error.
+     */
+    public static Context getHostBrowserContext(Context context) {
+        try {
+            String hostPackage = getHostBrowserPackageName(context);
+            return context.getApplicationContext().createPackageContext(
+                            hostPackage,
+                            Context.CONTEXT_IGNORE_SECURITY | Context.CONTEXT_INCLUDE_CODE);
+        } catch (NameNotFoundException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    /**
+     * Returns the package name for the host browser that was specified when building the WebAPK.
+     * @param context A context.
+     * @return The package name. Returns null on an error.
+     */
+    public static String getHostBrowserPackageName(Context context) {
+        if (sHostPackage != null) return sHostPackage;
+        String hostPackage = null;
+        try {
+            ApplicationInfo ai = context.getPackageManager().getApplicationInfo(
+                    context.getPackageName(), PackageManager.GET_META_DATA);
+            Bundle bundle = ai.metaData;
+            hostPackage = bundle.getString("runtimeHost");
+        } catch (NameNotFoundException e) {
+            e.printStackTrace();
+        }
+        sHostPackage = hostPackage != null ? hostPackage : DEFAULT_CHROME_PACKAGE_NAME;
+        return sHostPackage;
+    }
+}