Install downloaded WebAPK when "installation from unknown sources" is enabled

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java
index 86aa4f5ad46bfb55e4e1b59918aa0a6f5b735d88..fd0629e9ad4b94a5327049be5bd2eb96efba4fad 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java
@@ -4,17 +4,25 @@
 
 package org.chromium.chrome.browser.webapps;
 
+import android.content.ActivityNotFoundException;
 import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.provider.Settings;
 
 import org.chromium.base.ContextUtils;
+import org.chromium.base.Log;
 import org.chromium.base.annotations.CalledByNative;
-import org.chromium.chrome.browser.ChromeApplication;
+
+import java.io.File;
 
 /**
  * Java counterpart to webapk_installer.h
  * Contains functionality to install WebAPKs.
  */
-public abstract class WebApkInstaller {
+public class WebApkInstaller {
+    private static final String TAG = "WebApkInstaller";
+
     /**
      * Installs a WebAPK.
      * @param filePath File to install.
@@ -22,16 +30,40 @@ public abstract class WebApkInstaller {
      * @return True if the install was started. A "true" return value does not guarantee that the
      *         install succeeds.
      */
-    public abstract boolean installAsync(String filePath, String packageName);
-
     @CalledByNative
     static boolean installAsyncFromNative(String filePath, String packageName) {
-        Context context = ContextUtils.getApplicationContext();
-        WebApkInstaller apkInstaller = ((ChromeApplication) context).createWebApkInstaller();
-        if (apkInstaller == null) {
+        if (!installingFromUnknownSourcesAllowed()) {
+            Log.e(TAG,
+                    "WebAPK install failed because installation from unknown sources is disabled.");
+            return false;
+        }
+        if (!new File(filePath).exists()) {
+            return false;
+        }
+        Intent intent = new Intent(Intent.ACTION_VIEW);
+        Uri fileUri = Uri.fromFile(new File(filePath));
+        intent.setDataAndType(fileUri, "application/vnd.android.package-archive");
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        try {
+            ContextUtils.getApplicationContext().startActivity(intent);
+        } catch (ActivityNotFoundException e) {
             return false;
         }
-        apkInstaller.installAsync(filePath, packageName);
         return true;
     }
+
+    /**
+     * Returns whether the user has enabled installing apps from sources other than the Google Play
+     * Store.
+     */
+    private static boolean installingFromUnknownSourcesAllowed() {
+        Context context = ContextUtils.getApplicationContext();
+        try {
+            return Settings.Secure.getInt(
+                           context.getContentResolver(), Settings.Secure.INSTALL_NON_MARKET_APPS)
+                    == 1;
+        } catch (Settings.SettingNotFoundException e) {
+            return false;
+        }
+    }
 }