Skip installation process if WebAPK is already installed.

chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
index b174519765b4af9ef2162054881fadbf36241fd6..3a7d1b83beb75bb5dd7e7c310c3b7a8aa10ba6d1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
@@ -455,16 +455,22 @@ public class ShortcutHelper {
     }
 
     /**
-     * Returns true if WebAPKs are enabled and there is a WebAPK installed which can handle
+     * Returns the package name of the WebAPK if WebAPKs are enabled and there is an installed
+     * WebAPK which can handle {@link url}. Returns null otherwise.
+     */
+    @CalledByNative
+    private static String queryWebApkPackage(String url) {
+        if (!ChromeWebApkHost.isEnabled()) return null;
+        return WebApkValidator.queryWebApkPackage(ContextUtils.getApplicationContext(), url);
+    }
+
+    /**
+     * Returns true if WebAPKs are enabled and there is an installed WebAPK which can handle
      * {@link url}.
      */
     @CalledByNative
     private static boolean isWebApkInstalled(String url) {
-        if (!ChromeWebApkHost.isEnabled()) {
-            return false;
-        }
-        return WebApkValidator.queryWebApkPackage(ContextUtils.getApplicationContext(), url)
-                != null;
+        return queryWebApkPackage(url) != null;
     }
 
     /**