Don't try to update incessently when Shell APK version is out of date.

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 3aafbd3bec438d2d145808aba95ddb28c4857f52..b1ae7da7f0e3f120f5d4f21d6a14b6f08c0e5677 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
@@ -74,6 +74,10 @@ public class WebappDataStorage {
     // server if the previous update attempt failed.
     public static final long RETRY_UPDATE_DURATION = TimeUnit.HOURS.toMillis(12L);
 
+    // Number of milliseconds to wait before re-questing an update for shell APK if the previous
+    // update attempt failed.
+    public static final long RETRY_SHELL_APK_UPDATE_DURATION = TimeUnit.DAYS.toMillis(2L);
+
     // 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;
@@ -474,6 +478,13 @@ public class WebappDataStorage {
                 && !didPreviousUpdateSucceed();
     }
 
+    /** Returns whether we should request shell APK update. */
+    boolean shouldRequestShellApkUpdate() {
+        long sinceLastRequestDurationMs =
+                sClock.currentTimeMillis() - getLastWebApkUpdateRequestCompletionTime();
+        return sinceLastRequestDurationMs >= RETRY_SHELL_APK_UPDATE_DURATION;
+    }
+
     protected WebappDataStorage(String webappId) {
         mId = webappId;
         mPreferences = ContextUtils.getApplicationContext().getSharedPreferences(