Allow interrupted download to auto resume

For android DownloadManager, it can automatically resume download if
connectivity changes.
However, with chrome network stack, this won't happen automatically.
A download initiated on mobile network won't switch to
wifi automatically after mobile network is unreachable, e.g.

This change solves the problem by automatically resuming a download
after network status changes.
The resumption logic can be found internally in a PRD:
For download initiated in mobile, it can be resumed under wifi or
mobile.
For download initiated in wifi, it can only be resumed under wifi.

Whenenver a download is interrupted, we add it as a resumption candidate
if it can be resumed.
When network status changes, we check if any candidates can be resumed
and start them automatically.

BUG=460603

Committed: https://crrev.com/f2af782b65e6d24c839f0044bee018cf60fabc5c
Cr-Commit-Position: refs/heads/master@{#382883}

Review URL: https://codereview.chromium.org/1800103005

Cr-Commit-Position: refs/heads/master@{#383010}

1 files changed, 86 insertions, 64 deletions

diff --git a/content/public/android/java/src/org/chromium/content/browser/DownloadController.java b/content/public/android/java/src/org/chromium/content/browser/DownloadController.java
index e1a3d3d..63a5eb7 100644
--- a/content/public/android/java/src/org/chromium/content/browser/DownloadController.java
+++ b/content/public/android/java/src/org/chromium/content/browser/DownloadController.java
@@ -42,6 +42,13 @@ public class DownloadController {
          * @param downloadId Id of the download.
          */
         void onDownloadCancelled(final DownloadInfo downloadInfo);
+
+        /**
+         * Notify the host application that a download is interrupted.
+         * @param downloadInfo Information about the completed download.
+         * @param isAutoResumable Download can be auto resumed when network becomes available.
+         */
+        void onDownloadInterrupted(final DownloadInfo downloadInfo, boolean isAutoResumable);
     }
 
     private static DownloadNotificationService sDownloadNotificationService;
@@ -76,21 +83,20 @@ public class DownloadController {
             String filename, long contentLength) {
         ContentViewDownloadDelegate downloadDelegate = downloadDelegateFromView(view);
 
-        if (downloadDelegate != null) {
-            DownloadInfo downloadInfo = new DownloadInfo.Builder()
-                    .setUrl(url)
-                    .setUserAgent(userAgent)
-                    .setContentDisposition(contentDisposition)
-                    .setMimeType(mimeType)
-                    .setCookie(cookie)
-                    .setReferer(referer)
-                    .setHasUserGesture(hasUserGesture)
-                    .setFileName(filename)
-                    .setContentLength(contentLength)
-                    .setIsGETRequest(true)
-                    .build();
-            downloadDelegate.requestHttpGetDownload(downloadInfo);
-        }
+        if (downloadDelegate == null) return;
+        DownloadInfo downloadInfo = new DownloadInfo.Builder()
+                .setUrl(url)
+                .setUserAgent(userAgent)
+                .setContentDisposition(contentDisposition)
+                .setMimeType(mimeType)
+                .setCookie(cookie)
+                .setReferer(referer)
+                .setHasUserGesture(hasUserGesture)
+                .setFileName(filename)
+                .setContentLength(contentLength)
+                .setIsGETRequest(true)
+                .build();
+        downloadDelegate.requestHttpGetDownload(downloadInfo);
     }
 
     /**
@@ -114,26 +120,46 @@ public class DownloadController {
      * download. This can be either a POST download or a GET download with authentication.
      */
     @CalledByNative
-    private void onDownloadCompleted(String url, String mimeType,
-            String filename, String path, long contentLength, boolean successful, int downloadId,
-            String originalUrl, String refererUrl, boolean hasUserGesture) {
-        if (sDownloadNotificationService != null) {
-            DownloadInfo downloadInfo = new DownloadInfo.Builder()
-                    .setUrl(url)
-                    .setMimeType(mimeType)
-                    .setFileName(filename)
-                    .setFilePath(path)
-                    .setContentLength(contentLength)
-                    .setIsSuccessful(successful)
-                    .setDescription(filename)
-                    .setDownloadId(downloadId)
-                    .setHasDownloadId(true)
-                    .setOriginalUrl(originalUrl)
-                    .setReferer(refererUrl)
-                    .setHasUserGesture(hasUserGesture)
-                    .build();
-            sDownloadNotificationService.onDownloadCompleted(downloadInfo);
-        }
+    private void onDownloadCompleted(String url, String mimeType, String filename, String path,
+            long contentLength, int downloadId, String originalUrl, String refererUrl,
+            boolean hasUserGesture) {
+        if (sDownloadNotificationService == null) return;
+        DownloadInfo downloadInfo = new DownloadInfo.Builder()
+                .setUrl(url)
+                .setMimeType(mimeType)
+                .setFileName(filename)
+                .setFilePath(path)
+                .setContentLength(contentLength)
+                .setDescription(filename)
+                .setDownloadId(downloadId)
+                .setHasDownloadId(true)
+                .setOriginalUrl(originalUrl)
+                .setReferer(refererUrl)
+                .setHasUserGesture(hasUserGesture)
+                .build();
+        sDownloadNotificationService.onDownloadCompleted(downloadInfo);
+    }
+
+    /**
+     * Notifies the download delegate that a download completed and passes along info about the
+     * download. This can be either a POST download or a GET download with authentication.
+     */
+    @CalledByNative
+    private void onDownloadInterrupted(String url, String mimeType, String filename, String path,
+            long contentLength, int downloadId, boolean isResumable, boolean isAutoResumable) {
+        if (sDownloadNotificationService == null) return;
+        DownloadInfo downloadInfo = new DownloadInfo.Builder()
+                .setUrl(url)
+                .setMimeType(mimeType)
+                .setFileName(filename)
+                .setFilePath(path)
+                .setContentLength(contentLength)
+                .setDescription(filename)
+                .setDownloadId(downloadId)
+                .setHasDownloadId(true)
+                .setIsResumable(isResumable)
+                .build();
+        sDownloadNotificationService.onDownloadInterrupted(downloadInfo, isAutoResumable);
     }
 
     /**
@@ -142,13 +168,12 @@ public class DownloadController {
      */
     @CalledByNative
     private void onDownloadCancelled(int downloadId) {
-        if (sDownloadNotificationService != null) {
-            DownloadInfo downloadInfo = new DownloadInfo.Builder()
-                    .setDownloadId(downloadId)
-                    .setHasDownloadId(true)
-                    .build();
-            sDownloadNotificationService.onDownloadCancelled(downloadInfo);
-        }
+        if (sDownloadNotificationService == null) return;
+        DownloadInfo downloadInfo = new DownloadInfo.Builder()
+                .setDownloadId(downloadId)
+                .setHasDownloadId(true)
+                .build();
+        sDownloadNotificationService.onDownloadCancelled(downloadInfo);
     }
 
     /**
@@ -157,28 +182,25 @@ public class DownloadController {
      */
     @CalledByNative
     private void onDownloadUpdated(String url, String mimeType, String filename,
-            String path, long contentLength, boolean successful, int downloadId,
-            int percentCompleted, long timeRemainingInMs, boolean hasUserGesture, boolean isPaused,
-            boolean isResumable) {
-        if (sDownloadNotificationService != null) {
-            DownloadInfo downloadInfo = new DownloadInfo.Builder()
-                    .setUrl(url)
-                    .setMimeType(mimeType)
-                    .setFileName(filename)
-                    .setFilePath(path)
-                    .setContentLength(contentLength)
-                    .setIsSuccessful(successful)
-                    .setDescription(filename)
-                    .setDownloadId(downloadId)
-                    .setHasDownloadId(true)
-                    .setPercentCompleted(percentCompleted)
-                    .setTimeRemainingInMillis(timeRemainingInMs)
-                    .setHasUserGesture(hasUserGesture)
-                    .setIsPaused(isPaused)
-                    .setIsResumable(isResumable)
-                    .build();
-            sDownloadNotificationService.onDownloadUpdated(downloadInfo);
-        }
+            String path, long contentLength, int downloadId, int percentCompleted,
+            long timeRemainingInMs, boolean hasUserGesture, boolean isPaused, boolean isResumable) {
+        if (sDownloadNotificationService == null) return;
+        DownloadInfo downloadInfo = new DownloadInfo.Builder()
+                .setUrl(url)
+                .setMimeType(mimeType)
+                .setFileName(filename)
+                .setFilePath(path)
+                .setContentLength(contentLength)
+                .setDescription(filename)
+                .setDownloadId(downloadId)
+                .setHasDownloadId(true)
+                .setPercentCompleted(percentCompleted)
+                .setTimeRemainingInMillis(timeRemainingInMs)
+                .setHasUserGesture(hasUserGesture)
+                .setIsPaused(isPaused)
+                .setIsResumable(isResumable)
+                .build();
+        sDownloadNotificationService.onDownloadUpdated(downloadInfo);
     }
 
     /**