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 24120eba8d50ffe25ec4c1ebfaa7b58ca91f087b..e143418174ce88ea668293077adb70d855c6bca3 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
@@ -51,6 +51,7 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
     public ManifestUpgradeDetector(Tab tab, WebappInfo info) {
         mTab = tab;
         mWebappInfo = info;
+        getMetaDataFromAndroidManifest();
     }
 
     @VisibleForTesting
@@ -73,8 +74,6 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
         }
 
         if (mNativePointer != 0) return;
-
-        getMetaDataFromAndroidManifest();
         mNativePointer = nativeInitialize(mTab.getWebContents(),
                 mWebappInfo.scopeUri().toString(), mWebappInfo.webManifestUri().toString());
 
@@ -141,7 +140,7 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
                 mWebappInfo.source(), themeColor, backgroundColor, mWebappInfo.isIconGenerated(),
                 mWebappInfo.webApkPackageName(), mWebappInfo.webManifestUri().toString());
         if (requireUpgrade(newInfo)) {
-            upgrade();
+            upgrade(newInfo);
         }
     }
 
@@ -173,7 +172,9 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
         return false;
     }
 
-    private void upgrade() {}
+    private void upgrade(WebappInfo newInfo) {
+        WebApkUpdateManager.updateAsync(newInfo);
+    }
 
     private native long nativeInitialize(WebContents webContents, String scope,
             String webManifestUrl);