Add calls to the server to request WebAPK updates.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
index 29cb18fcc650fafd93f2b9bed62fcd7ea80a5f94..1c816dd7bdb34936dc527f1b0f3e49c4997a9461 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
@@ -46,6 +46,19 @@ public class WebappDataStorage {
     static final String KEY_VERSION = "version";
     static final String KEY_WEBAPK_PACKAGE_NAME = "webapk_package_name";
 
+    // The last time that Chrome checks Web Manifest updates for a WebAPK.

[pkotwicz, 2016/08/11 22:02:44]

How about: "The last time that Chrome checked for Web Manifest updates for a
WebAPK."

[Xi Han, 2016/08/15 21:38:45]

Done.

+    public static final String KEY_LAST_CHECK_WEB_MANIFEST_UPDATE_TIME =
+            "last_check_web_manifest_update_time";
+
+    // The last time that the WebAPK update request completed (successfully or
+    // unsuccessfully).
+    public static final String KEY_LAST_WEBAPK_UPDATE_REQUEST_COMPLETE_TIME =
+            "last_webapk_update_request_complete_time";
+
+    // Whether the last WebAPK update request succeeds.

[pkotwicz, 2016/08/11 22:02:43]

Nit: succeeds -> succeeded

[Xi Han, 2016/08/15 21:38:45]

Done.

+    public static final String KEY_DOES_LAST_WEBAPK_UPDATE_REQUEST_SUCCEED =
+            "does_last_webapk_update_request_succeed";
+
     // Unset/invalid constants for last used times and URLs. 0 is used as the null last
     // used time as WebappRegistry assumes that this is always a valid timestamp.
     static final long LAST_USED_UNSET = 0;
@@ -166,7 +179,7 @@ public class WebappDataStorage {
     }
 
     /**
-     * Deletes the URL and scope, and sets last used time to 0 in SharedPreferences.
+     * Deletes the URL and scope, and sets all timestamps to 0 in SharedPreferences.
      * This does not remove the stored splash screen image (if any) for the app.
      * @param context  The context to read the SharedPreferences file.
      * @param webappId The ID of the web app for which history is being cleared.
@@ -181,6 +194,9 @@ public class WebappDataStorage {
         editor.putLong(KEY_LAST_USED, LAST_USED_UNSET);
         editor.remove(KEY_URL);
         editor.remove(KEY_SCOPE);
+        editor.remove(KEY_LAST_CHECK_WEB_MANIFEST_UPDATE_TIME);
+        editor.remove(KEY_LAST_WEBAPK_UPDATE_REQUEST_COMPLETE_TIME);
+        editor.remove(KEY_DOES_LAST_WEBAPK_UPDATE_REQUEST_SUCCEED);
         editor.apply();
     }
 
@@ -401,6 +417,56 @@ public class WebappDataStorage {
     }
 
     /**
+     *  Updates the time of the last check for whether the WebAPK's Web Manifest was updated.
+     */
+    void updateTimeOfLastCheckForUpdatedWebManifest() {
+        mPreferences.edit()
+                .putLong(KEY_LAST_CHECK_WEB_MANIFEST_UPDATE_TIME, sClock.currentTimeMillis())
+                .apply();
+    }
+
+    /**
+     * Returns the time of the last check for whether the WebAPK's Web Manifest was updated.
+     */
+    long getLastCheckForWebManifestUpdateTime() {
+        return mPreferences.getLong(KEY_LAST_CHECK_WEB_MANIFEST_UPDATE_TIME, LAST_USED_INVALID);
+    }
+
+    /**
+     * Updates the time that the last WebAPK update request completed (successfully or
+     * unsuccessfully).
+     */
+    void updateTimeOfLastWebApkUpdateRequestCompletion() {
+        mPreferences.edit()
+                .putLong(KEY_LAST_WEBAPK_UPDATE_REQUEST_COMPLETE_TIME, sClock.currentTimeMillis())
+                .apply();
+    }
+
+    /**
+     * Returns the time that the last WebAPK update request completed (successfully or
+     * unsuccessfully).
+     */
+    long getLastWebApkUpdateRequestCompletionTime() {
+        return mPreferences.getLong(
+                KEY_LAST_WEBAPK_UPDATE_REQUEST_COMPLETE_TIME, LAST_USED_INVALID);
+    }
+
+    /**
+     * Updates the result of whether the last update request to WebAPK Server succeeds.

[pkotwicz, 2016/08/11 22:02:44]

Nits:
- "succeeds" -> "succeeded"
- updateDoesLastWebApkUpdateRequestSucceed() ->
updateDidLastWebApkUpdateRequestSucceed()

[Xi Han, 2016/08/15 21:38:45]

Done.

+     */
+    void updateDoesLastWebApkUpdateRequestSucceed(boolean sucess) {
+        mPreferences.edit()
+                .putBoolean(KEY_DOES_LAST_WEBAPK_UPDATE_REQUEST_SUCCEED, sucess)
+                .apply();
+    }
+
+    /**
+     * Returns whether the last update request to WebAPK Server succeeds.

[pkotwicz, 2016/08/11 22:02:44]

Nits:
- "succeeds" -> "succeeded"
- getDoesLastWebApkUpdateRequestSucceed() ->
getDidLastWebApkUpdateRequestSucceed()

[Xi Han, 2016/08/15 21:38:45]

Done.

+     */
+    boolean getDoesLastWebApkUpdateRequestSucceed() {
+        return mPreferences.getBoolean(KEY_DOES_LAST_WEBAPK_UPDATE_REQUEST_SUCCEED, false);
+    }
+    /**
      * Returns true if this web app has been launched from home screen recently (within
      * WEBAPP_LAST_OPEN_MAX_TIME milliseconds).
      */