Add unit tests for the Background Scheduler.

chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java
index 4b988402734e78d1f374a5675d9af4ce131110a1..499bbd23150b7cd9c0e87b2121456c91a05f522f 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java
@@ -21,6 +21,7 @@ import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge;
 import org.chromium.chrome.browser.ntp.snippets.SnippetsLauncher;
 import org.chromium.chrome.browser.offlinepages.BackgroundOfflinerTask;
 import org.chromium.chrome.browser.offlinepages.OfflinePageUtils;
+import org.chromium.chrome.browser.offlinepages.SchedulerBridge;
 import org.chromium.chrome.browser.precache.PrecacheController;
 
 /**
@@ -125,13 +126,15 @@ public class ChromeBackgroundService extends GcmTaskService {
         PrecacheController.get(context).precache(tag);
     }
 
+    @VisibleForTesting

[dougarnett, 2016/06/02 00:14:45]

? but the following method is private so confused by this annotation

[Pete Williamson, 2016/06/02 00:42:06]

I meant to mark it as testable since the test now calls it.  Not sure why it
compiled, but I changed it to protected like the others.

     private void handleOfflinePageBackgroundLoad(Context context, Bundle bundle) {
         if (!hasPrecacheInstance()) {
             launchBrowser(context);
         }
 
         // Call BackgroundTask, provide context.
-        BackgroundOfflinerTask.startBackgroundRequests(context, bundle);
+        BackgroundOfflinerTask task = new BackgroundOfflinerTask(new SchedulerBridge());
+        task.startBackgroundRequests(context, bundle);
         // TODO(petewil) if processBackgroundRequest returns false, return RESTART_RESCHEDULE
         // to the GcmNetworkManager
     }