add methods to URLFetcherDelegate to get download data from URLFetcherCore:

1) OnUrlFetchDownloadData to get current download buffer.
2) ShouldSendDownloadData to indicate if OnUrlFetchDownloadData should be called.

BUG=chromium-os:29905
TEST=nothing yet.


Review URL: http://codereview.chromium.org/10227007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134207 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 24 insertions, 0 deletions

diff --git a/content/common/net/url_fetcher_core.cc b/content/common/net/url_fetcher_core.cc
index a067ed6..0a4b7ee 100644
--- a/content/common/net/url_fetcher_core.cc
+++ b/content/common/net/url_fetcher_core.cc
@@ -616,6 +616,7 @@ void URLFetcherCore::OnReadCompleted(net::URLRequest* request,
 
     current_response_bytes_ += bytes_read;
     InformDelegateDownloadProgress();
+    InformDelegateDownloadDataIfNecessary(bytes_read);
 
     if (!WriteBuffer(bytes_read)) {
       // If WriteBuffer() returns false, we have a pending write to
@@ -881,6 +882,26 @@ void URLFetcherCore::InformDelegateDownloadProgressInDelegateThread(
     delegate_->OnURLFetchDownloadProgress(fetcher_, current, total);
 }
 
+void URLFetcherCore::InformDelegateDownloadDataIfNecessary(int bytes_read) {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  if (delegate_ && delegate_->ShouldSendDownloadData()) {
+    scoped_ptr<std::string> download_data(
+        new std::string(buffer_->data(), bytes_read));
+    delegate_loop_proxy_->PostTask(
+        FROM_HERE,
+        base::Bind(
+            &URLFetcherCore::InformDelegateDownloadDataInDelegateThread,
+            this, base::Passed(&download_data)));
+  }
+}
+
+void URLFetcherCore::InformDelegateDownloadDataInDelegateThread(
+    scoped_ptr<std::string> download_data) {
+  DCHECK(delegate_loop_proxy_->BelongsToCurrentThread());
+  if (delegate_)
+    delegate_->OnURLFetchDownloadData(fetcher_, download_data.Pass());
+}
+
 void URLFetcherCore::InformDelegateFetchIsComplete() {
   DCHECK(delegate_loop_proxy_->BelongsToCurrentThread());
   if (delegate_)
diff --git a/content/common/net/url_fetcher_core.h b/content/common/net/url_fetcher_core.h
index d0e67ff..db190a4 100644
--- a/content/common/net/url_fetcher_core.h
+++ b/content/common/net/url_fetcher_core.h
@@ -293,6 +293,9 @@ class URLFetcherCore
   void InformDelegateDownloadProgress();
   void InformDelegateDownloadProgressInDelegateThread(int64 current,
                                                       int64 total);
+  void InformDelegateDownloadDataIfNecessary(int bytes_read);
+  void InformDelegateDownloadDataInDelegateThread(
+      scoped_ptr<std::string> download_data);
 
   URLFetcher* fetcher_;              // Corresponding fetcher object
   GURL original_url_;                // The URL we were asked to fetch