Adds request queue removal capability to OfflinePageBridge.

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
index 727cc561830a6558714fd012e60100cf855f5cf2..5013c367254afd23d85a94c644b1c266956231e1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
@@ -244,6 +244,25 @@ public class OfflinePageBridge {
         nativeGetRequestsInQueue(mNativeOfflinePageBridge, callback);
     }
 
+    /**
+     * Removes SavePageRequests from the request queue.
+     *
+     * The callback will be called with |null| in the case that the request coordinator is

[dougarnett, 2016/08/19 19:35:59]

Consider if this wording may be better for api consumer:
... in the case that the request queue is not available. ?

[dewittj, 2016/08/19 20:21:17]

Done.

+     * unavailable.
+     *
+     * @param requests The requests to remove
+     * @param callback Called when the removal is done, with the SavePageRequest objects that were
+     *     actually removed.
+     */
+    public void clearRequestsFromQueue(

[dougarnett, 2016/08/19 18:26:31]

Wonder why introduce "clear" terminology vs. remove (used in above javadoc and
unit test name) or delete (used in this file for for pages). Is clear used in
other similar apis? 

[dewittj, 2016/08/19 20:21:17]

Done.

+            List<SavePageRequest> requests, Callback<SavePageRequest[]> callback) {
+        long[] requestIds = new long[requests.size()];
+        for (int i = 0; i < requests.size(); i++) {
+            requestIds[i] = requests.get(i).getRequestId();
+        }
+        nativeClearRequestsFromQueue(mNativeOfflinePageBridge, requestIds, callback);
+    }
+
     private List<OfflinePageItem> getPagesByClientIdInternal(ClientId clientId) {
         Set<Long> ids = getOfflineIdsForClientId(clientId);
         List<OfflinePageItem> result = new ArrayList<>();
@@ -536,6 +555,10 @@ public class OfflinePageBridge {
             long nativeOfflinePageBridge, Callback<SavePageRequest[]> callback);
 
     @VisibleForTesting
+    native void nativeClearRequestsFromQueue(
+            long nativeOfflinePageBridge, long[] requestIds, Callback<SavePageRequest[]> callback);
+
+    @VisibleForTesting
     native OfflinePageItem nativeGetPageByOfflineId(long nativeOfflinePageBridge, long offlineId);
     private native void nativeSelectPageForOnlineUrl(
             long nativeOfflinePageBridge, String onlineUrl, int tabId,