Add calls to the server to request WebAPK updates.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/ManifestUpgradeDetector.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/ManifestUpgradeDetector.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/ManifestUpgradeDetector.java
index 5ac4b9d5f0987380001ce309a25499f6c15d60cc..0d485da5ce3ef765f0d040d8c5db0ab1144b2754 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/ManifestUpgradeDetector.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/ManifestUpgradeDetector.java
@@ -43,6 +43,7 @@ public class ManifestUpgradeDetector implements ManifestUpgradeDetectorFetcher.C
     public ManifestUpgradeDetector(Tab tab, WebappInfo info) {
         mTab = tab;
         mWebappInfo = info;
+        getMetaDataFromAndroidManifest();
     }
 
     /**
@@ -56,7 +57,6 @@ public class ManifestUpgradeDetector implements ManifestUpgradeDetectorFetcher.C
 
         if (mFetcher != null) return;
 
-        getMetaDataFromAndroidManifest();
         mFetcher = createFetcher(
                 mTab, mWebappInfo.scopeUri().toString(), mWebappInfo.webManifestUri().toString());
         mFetcher.start(this);
@@ -107,7 +107,7 @@ public class ManifestUpgradeDetector implements ManifestUpgradeDetectorFetcher.C
                 mWebappInfo.source(), themeColor, backgroundColor, mWebappInfo.isIconGenerated(),
                 mWebappInfo.webApkPackageName(), mWebappInfo.webManifestUri().toString());
         if (requireUpgrade(newInfo)) {
-            upgrade();
+            upgrade(newInfo);
         }
 
         onComplete();
@@ -141,7 +141,9 @@ public class ManifestUpgradeDetector implements ManifestUpgradeDetectorFetcher.C
         return false;
     }
 
-    protected void upgrade() {}
+    private void upgrade(WebappInfo newInfo) {
+        WebApkUpdateManager.updateAsync(newInfo);
+    }
 
     protected void onComplete() {}
 }