[fsp] First part of support for reading files.

chrome/browser/chromeos/file_system_provider/provided_file_system.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system.h b/chrome/browser/chromeos/file_system_provider/provided_file_system.h
index 1d20f2677f6611d67e9e7eb5654a9cba87d37bae..dffc73e40584e5a7f497f4cebf48c5a1fe9fcae1 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system.h
@@ -10,6 +10,10 @@
 #include "chrome/browser/chromeos/file_system_provider/request_manager.h"
 #include "webkit/browser/fileapi/async_file_util.h"
 
+namespace net {
+class IOBuffer;
+}  // namespace net
+
 namespace base {
 class FilePath;
 }  // namespace base
@@ -45,6 +49,11 @@ class ProvidedFileSystem : public ProvidedFileSystemInterface {
   virtual void CloseFile(
       int file_handle,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
+  virtual void ReadFile(int file_handle,
+                        net::IOBuffer* buffer,
+                        int64 offset,
+                        int length,
+                        const ReadChunkReceivedCallback& callback) OVERRIDE;
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const OVERRIDE;
   virtual RequestManager* GetRequestManager() OVERRIDE;