GData save package support with MHTML.

* Introduce SavePackageFilePickerChromeOS, which derives from SavePackageFilePicker. 
* For gdata targets, we save the selected path, create a temporary mhtml file using WebContents::GenerateMHTML, and call GDataFileSystem::TransferFile to transfer the file to gdata.
* For non-gdata targets, we just generate the mhtml file in place.
* DownloadObserver::GetGDataTempDownloadPath is a static helper method to create a temporary gdata download file, used by SavePackageFilePickerChromeOS and DownloadFilePickerChromeOS.


BUG=chromium-os:28210
TEST=Go to a web page, use Save As, or ctrl-s to save a page to docs.
TBR=rdsmith@chromium.org
Review URL: https://chromiumcodereview.appspot.com/9809011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129115 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 15 insertions, 0 deletions

diff --git a/chrome/browser/chromeos/gdata/gdata_download_observer.cc b/chrome/browser/chromeos/gdata/gdata_download_observer.cc
index f5cc19c..4f14a63 100644
--- a/chrome/browser/chromeos/gdata/gdata_download_observer.cc
+++ b/chrome/browser/chromeos/gdata/gdata_download_observer.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/chromeos/gdata/gdata_download_observer.h"
 
+#include "base/file_util.h"
 #include "chrome/browser/chromeos/gdata/gdata_uploader.h"
 #include "chrome/browser/chromeos/gdata/gdata_upload_file_info.h"
 #include "chrome/browser/chromeos/gdata/gdata_util.h"
@@ -153,6 +154,20 @@ int GDataDownloadObserver::PercentComplete(DownloadItem* download) {
   return -1;
 }
 
+// |gdata_tmp_download_path| is set to a temporary local download path in
+// ~/GCache/v1/tmp/downloads/
+// static
+void GDataDownloadObserver::GetGDataTempDownloadPath(
+    const FilePath& gdata_tmp_download_dir,
+    FilePath* gdata_tmp_download_path) {
+  bool created = file_util::CreateDirectory(gdata_tmp_download_dir);
+  DCHECK(created) << "Can not create temp download directory at "
+                  << gdata_tmp_download_dir.value();
+  created = file_util::CreateTemporaryFileInDir(gdata_tmp_download_dir,
+                                                gdata_tmp_download_path);
+  DCHECK(created) << "Temporary download file creation failed";
+}
+
 void GDataDownloadObserver::ManagerGoingDown(
     DownloadManager* download_manager) {
   download_manager->RemoveObserver(this);