Evict drive cache with file download from website if necessary.

chrome/browser/chromeos/drive/download_handler.h

Index: chrome/browser/chromeos/drive/download_handler.h
diff --git a/chrome/browser/chromeos/drive/download_handler.h b/chrome/browser/chromeos/drive/download_handler.h
index 9973224c1b5c5fad0aa60af49d60f97ce55ee510..c0f36d1ed9552be209042398be617026e7f56e1f 100644
--- a/chrome/browser/chromeos/drive/download_handler.h
+++ b/chrome/browser/chromeos/drive/download_handler.h
@@ -73,6 +73,21 @@ class DownloadHandler : public AllDownloadItemNotifier::Observer {
       const content::DownloadItem* download,
       const content::CheckForFileExistenceCallback& callback);
 
+  // Calculates request space for |downloads|.
+  int64 CalculateRequestSpace(
+      const content::DownloadManager::DownloadVector& downloads);
+
+  // Checks available storage space and free disk space if necessary. Actual
+  // execution is delayed and rate limited.
+  void FreeDiskSpaceIfNeeded();
+
+  // Checks available storage space and free disk space if necessary. This is
+  // executed immediately.
+  void FreeDiskSpaceIfNeededImmediately();
+
+  // Sets free disk space delay for testing.
+  void SetFreeDiskSpaceDelayForTesting(const base::TimeDelta& delay);
+
  private:
   // AllDownloadItemNotifier::Observer overrides:
   void OnDownloadCreated(content::DownloadManager* manager,
@@ -104,6 +119,7 @@ class DownloadHandler : public AllDownloadItemNotifier::Observer {
   content::DownloadManager* GetDownloadManager(void* manager_id);
 
   FileSystemInterface* file_system_;  // Owned by DriveIntegrationService.
+
   // Observe the DownloadManager for new downloads.
   scoped_ptr<AllDownloadItemNotifier> notifier_;
   scoped_ptr<AllDownloadItemNotifier> notifier_incognito_;
@@ -111,6 +127,11 @@ class DownloadHandler : public AllDownloadItemNotifier::Observer {
   // Temporary download location directory.
   base::FilePath drive_tmp_download_path_;
 
+  // True if there is pending FreeDiskSpaceIfNeeded call.
+  bool has_pending_free_disk_space_;
+
+  base::TimeDelta free_disk_space_delay_;
+
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DownloadHandler> weak_ptr_factory_;