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 3b3efda710ec17764bc66f490af9e8eed63d49c7..61ddd014934523a5cd9c140512a10a2c762e0ce0 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 +51,11 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
     public ManifestUpgradeDetector(Tab tab, WebappInfo info) {
         mTab = tab;
         mWebappInfo = info;
+        getMetaDataFromAndroidManifest();
+    }
+
+    WebappInfo getWebappInfo() {
+        return mWebappInfo;
     }
 
     @VisibleForTesting
@@ -73,8 +78,6 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
         }
 
         if (mNativePointer != 0) return;
-
-        getMetaDataFromAndroidManifest();
         mNativePointer = nativeInitialize(mTab.getWebContents(),
                 mWebappInfo.scopeUri().toString(), mWebappInfo.webManifestUri().toString());
 
@@ -173,7 +176,9 @@ public class ManifestUpgradeDetector extends EmptyTabObserver {
         return false;
     }
 
-    private void upgrade() {}
+    private void upgrade() {
+        WebApkUpdateManager.updateAsync(mWebappInfo);

[pkotwicz, 2016/08/03 01:07:06]

Shouldn't you call WebApkUpdateManager with the newly fetched Web Manifest info?
Otherwise, in the case of a OneOffWebAPK the WebAPK server will generate the
exact same OneOffWebApk

[Xi Han, 2016/08/03 17:30:04]

Discussed with Glen, yes, we need to send the new data. Thanks for catching
this.

+    }
 
     private native long nativeInitialize(WebContents webContents, String scope,
             String webManifestUrl);