[Android] Enable WebAPK to have multiple intent filters

chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/MainActivity.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.webapk.shell_apk;
 
 import android.app.Activity;
 import android.content.ActivityNotFoundException;
 import android.content.Context;
 import android.content.Intent;
@@ skipping 72 matching lines @@
         }
 
         mOverrideUrl = getOverrideUrl();
         mStartUrl = (mOverrideUrl != null) ? mOverrideUrl
                                            : metadata.getString(WebApkMetaDataKeys.START_URL);
         if (mStartUrl == null) {
             finish();
             return;
         }
 
+        // The WebAPK may have been launched as a result of an intent filter for a different
+        // scheme or top level domain. Rewrite the scheme and host name to the scope's
+        // scheme and host name.
+        String scopeUrl = metadata.getString(WebApkMetaDataKeys.SCOPE);
+        if (!TextUtils.isEmpty(scopeUrl)) {
+            Uri parsedStartUrl = Uri.parse(mStartUrl);
+            Uri parsedScope = Uri.parse(scopeUrl);
+            mStartUrl = parsedStartUrl.buildUpon()
+                                .scheme(parsedScope.getScheme())
+                                .encodedAuthority(parsedScope.getEncodedAuthority())
+                                .build()
+                                .toString();
+        }
+
         Log.v(TAG, "Url of the WebAPK: " + mStartUrl);
         String packageName = getPackageName();
         Log.v(TAG, "Package name of the WebAPK:" + packageName);
 
         String runtimeHostInPreferences = WebApkUtils.getHostBrowserFromSharedPreference(this);
         String runtimeHost = WebApkUtils.getHostBrowserPackageName(this);
         if (!TextUtils.isEmpty(runtimeHostInPreferences)
                 && !runtimeHostInPreferences.equals(runtimeHost)) {
             deleteSharedPref(this);
             deleteInternalStorage();
@@ skipping 151 matching lines @@
                     public void onConfirmQuit() {
                         finish();
                     }
                 };
 
         InstallHostBrowserDialog.show(this, listener, getString(R.string.name),
                 lastResortHostBrowserPackageName, lastResortHostBrowserApplicationName,
                 R.drawable.last_resort_runtime_host_logo);
     }
 }