Android: Use a ResourceThrottle to intercept GET downloads.

content/browser/android/download_controller_android_impl.cc

 // Copyright (c) 2012 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 "content/browser/android/download_controller_android_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 61 matching lines @@
   }
 }
 
 // Initialize references to Java object.
 void DownloadControllerAndroidImpl::Init(JNIEnv* env, jobject obj) {
   java_object_ = new JavaObject;
   java_object_->obj = env->NewWeakGlobalRef(obj);
 }
 
 void DownloadControllerAndroidImpl::CreateGETDownload(
-    RenderViewHost* render_view_host,
-    int request_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  int render_process_id = render_view_host->GetProcess()->GetID();
+    int render_process_id, int render_view_id, int request_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   GlobalRequestID global_id(render_process_id, request_id);
 
   // We are yielding the UI thread and render_view_host may go away by
   // the time we come back. Pass along render_process_id and render_view_id
   // to retrieve it later (if it still exists).
   GetDownloadInfoCB cb = base::Bind(
         &DownloadControllerAndroidImpl::StartAndroidDownload,
         base::Unretained(this), render_process_id,
-        render_view_host->GetRoutingID());
-  BrowserThread::PostTask(
-      BrowserThread::IO, FROM_HERE,
-      base::Bind(
-          &DownloadControllerAndroidImpl::PrepareDownloadInfo,
-          base::Unretained(this), global_id,
-          base::Bind(&DownloadControllerAndroidImpl::StartDownloadOnUIThread,
-                     base::Unretained(this), cb)));
+        render_view_id);
+
+  PrepareDownloadInfo(
+      global_id,
+      base::Bind(&DownloadControllerAndroidImpl::StartDownloadOnUIThread,
+                 base::Unretained(this), cb));
 }
 
 void DownloadControllerAndroidImpl::PrepareDownloadInfo(
     const GlobalRequestID& global_id,
     const GetDownloadInfoCB& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   net::URLRequest* request =
       ResourceDispatcherHostImpl::Get()->GetURLRequest(global_id);
   if (!request) {
@@ skipping 225 matching lines @@
     referer = referer_url.spec();
   if (!request->url_chain().empty()) {
     original_url = request->url_chain().front();
     url = request->url_chain().back();
   }
 }
 
 DownloadControllerAndroidImpl::DownloadInfoAndroid::~DownloadInfoAndroid() {}
 
 }  // namespace content