Wired GDataFileSystem::GetFile() method with internal cache.

chrome/browser/chromeos/gdata/gdata.h

Index: chrome/browser/chromeos/gdata/gdata.h
diff --git a/chrome/browser/chromeos/gdata/gdata.h b/chrome/browser/chromeos/gdata/gdata.h
index 81295cdb5598c8d2f9f7633584458dea7bae0b37..10db0f8b630d202b7d1c5c7ef38593ffa8da071d 100644
--- a/chrome/browser/chromeos/gdata/gdata.h
+++ b/chrome/browser/chromeos/gdata/gdata.h
@@ -184,6 +184,7 @@ class DocumentsServiceInterface {
   //
   // Can be called on any thread.
   virtual void DownloadDocument(const FilePath& virtual_path,
+                                const FilePath& local_cache_path,
                                 const GURL& content_url,
                                 DocumentExportFormat format,
                                 const DownloadActionCallback& callback) = 0;
@@ -240,11 +241,13 @@ class DocumentsServiceInterface {
                                const FilePath::StringType& directory_name,
                                const GetDataCallback& callback) = 0;
 
-  // Downloads a file identified by its |content_url|. Upon completion, invokes
+  // Downloads a file identified by its |content_url|. The downloaded file will
+  // be stored at |local_cache_path| location. Upon completion, invokes
   // |callback| with results on the calling thread.
   //
   // Can be called on any thread.
   virtual void DownloadFile(const FilePath& virtual_path,
+                            const FilePath& local_cache_path,
                             const GURL& content_url,
                             const DownloadActionCallback& callback) = 0;
 
@@ -282,9 +285,14 @@ class DocumentsService
                               const EntryActionCallback& callback) OVERRIDE;
   virtual void DownloadDocument(
       const FilePath& virtual_path,
+      const FilePath& local_cache_path,
       const GURL& content_url,
       DocumentExportFormat format,
       const DownloadActionCallback& callback) OVERRIDE;
+  virtual void DownloadFile(const FilePath& virtual_path,
+                            const FilePath& local_cache_path,
+                            const GURL& content_url,
+                            const DownloadActionCallback& callback) OVERRIDE;
   virtual void CopyDocument(const GURL& document_url,
                             const FilePath::StringType& new_name,
                             const GetDataCallback& callback) OVERRIDE;
@@ -303,9 +311,6 @@ class DocumentsService
   virtual void CreateDirectory(const GURL& parent_content_url,
                                const FilePath::StringType& directory_name,
                                const GetDataCallback& callback) OVERRIDE;
-  virtual void DownloadFile(const FilePath& virtual_path,
-                            const GURL& content_url,
-                            const DownloadActionCallback& callback) OVERRIDE;
   virtual void InitiateUpload(const InitiateUploadParams& params,
                               const InitiateUploadCallback& callback) OVERRIDE;
   virtual void ResumeUpload(const ResumeUploadParams& params,