[fsp] Add support for opening files.

chrome/common/extensions/api/file_system_provider.idl

Index: chrome/common/extensions/api/file_system_provider.idl
diff --git a/chrome/common/extensions/api/file_system_provider.idl b/chrome/common/extensions/api/file_system_provider.idl
index f8ed6ba789618ee6dd9b184d4b63e1d6fa21c6ea..8942bda4efd015c4411082737103064bc49095a1 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -29,6 +29,12 @@ namespace fileSystemProvider {
     IO
   };
 
+  // Mode of opening a file. Used by <code>onOpenFileRequested</code>.
+  enum OpenFileMode {
+    READ,
+    WRITE
+  };
+
   // Represents metadata of a file or a directory.
   dictionary EntryMetadata {
     // True if it is a directory.
@@ -116,7 +122,7 @@ namespace fileSystemProvider {
         long fileSystemId,
         DOMString entryPath,
         MetadataCallback successCallback,
-        ErrorCallback errorCallback);
+        ProviderErrorCallback errorCallback);
 
     // Raised when contents of a directory at <code>directoryPath</code> are
     // requested. The results should be returned in chunks by calling the <code>
@@ -126,7 +132,18 @@ namespace fileSystemProvider {
         long fileSystemId,
         DOMString directoryPath,
         EntriesCallback successCallback,
-        ErrorCallback errorCallback);
+        ProviderErrorCallback errorCallback);
+
+    // Raised when opening a file at <code>filePath</code> is requested.
+    // If <code>create</code> is set to <code>true</code> and the file does not
+    // exist, then it should be created.
+    [maxListeners=1] static void onOpenFileRequested(
+        long fileSystemId,
+        DOMString filePath,
+        OpenFileMode mode,
+        boolean create,
+        ProviderSuccessCallback successCallback,
+        ProviderErrorCallback errorCallback);
   };
 };