reintroduce InterceptDownloadResourceThrottle for some OMA DRM downloads

chrome/browser/android/download/download_controller.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/download/download_controller.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/android/context_utils.h"
@@ skipping 201 matching lines @@
         BrowserThread::UI, FROM_HERE, base::Bind(cb, true));
     return;
   }
   // Make copy on the heap so we can pass the pointer through JNI.
   intptr_t callback_id = reinterpret_cast<intptr_t>(
       new DownloadControllerBase::AcquireFileAccessPermissionCallback(cb));
   ChromeDownloadDelegate::FromWebContents(web_contents)->
       RequestFileAccess(callback_id);
 }
 
+void DownloadController::CreateGETDownload(
+    const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
+    const DownloadInfo& info) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&DownloadController::StartAndroidDownload,
+                 base::Unretained(this),
+                 wc_getter, info));
+}
+
+void DownloadController::StartAndroidDownload(
+    const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
+    const DownloadInfo& info) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  WebContents* web_contents = wc_getter.Run();
+  if (!web_contents) {
+    // The view went away. Can't proceed.
+    LOG(ERROR) << "Download failed on URL:" << info.url.spec();
+    return;
+  }
+
+  AcquireFileAccessPermission(
+      web_contents,
+      base::Bind(&DownloadController::StartAndroidDownloadInternal,
+                 base::Unretained(this), wc_getter, info));
+}
+
+void DownloadController::StartAndroidDownloadInternal(
+    const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
+    const DownloadInfo& info, bool allowed) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (!allowed)
+    return;
+
+  WebContents* web_contents = wc_getter.Run();
+  if (!web_contents)
+    return;

[David Trainor- moved to gerrit, 2017/01/24 17:13:35]

Should this case log a similar error to StartAndroidDownload()?

[qinmin, 2017/01/24 17:32:23]

Done.

+
+  ChromeDownloadDelegate::FromWebContents(web_contents)->
+      EnqueueDownloadManagerRequest(
+          info.url.spec(), info.user_agent,
+          info.content_disposition, info.original_mime_type,
+          info.cookie, info.referer);
+}
+
 bool DownloadController::HasFileAccessPermission(
     ui::WindowAndroid* window_android) {
   ScopedJavaLocalRef<jobject> jwindow_android = window_android->GetJavaObject();
 
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!jwindow_android.is_null());
 
   JNIEnv* env = base::android::AttachCurrentThread();
   return Java_DownloadController_hasFileAccess(
       env, GetJavaObject()->Controller(env), jwindow_android);
@@ skipping 97 matching lines @@
 void DownloadController::StartContextMenuDownload(
     const ContextMenuParams& params, WebContents* web_contents, bool is_link,
     const std::string& extra_headers) {
   int process_id = web_contents->GetRenderProcessHost()->GetID();
   int routing_id = web_contents->GetRenderViewHost()->GetRoutingID();
   AcquireFileAccessPermission(
       web_contents, base::Bind(&CreateContextMenuDownload, process_id,
                                routing_id, params, is_link, extra_headers));
 }