[fsp] First part of support for reading files.

chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js

Index: chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js b/chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js
index 9ea4a0122953ffcf0ae33f5dc6e9a325deccaff8..21130930532968d8cb7cb40585eb51848fa46545 100644
--- a/chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js
@@ -181,4 +181,42 @@ eventBindings.registerArgumentMassager(
                 onErrorCallback]);
     });
 
+eventBindings.registerArgumentMassager(
+    'fileSystemProvider.onCloseFileRequested',
+    function(args, dispatch) {
+      var fileSystemId = args[0];
+      var requestId = args[1];
+      var openRequestId = args[2];
+      var onSuccessCallback = function() {
+        fileSystemProviderInternal.closeFileRequestedSuccess(
+            fileSystemId, requestId);
+      };
+      var onErrorCallback = function(error) {
+        fileSystemProviderInternal.closeFileRequestedError(
+          fileSystemId, requestId, error);
+      }
+      dispatch([fileSystemId, requestId, openRequestId, onSuccessCallback,
+                onErrorCallback]);
+    });
+
+eventBindings.registerArgumentMassager(
+    'fileSystemProvider.onReadFileRequested',
+    function(args, dispatch) {
+      var fileSystemId = args[0];
+      var requestId = args[1];
+      var openRequestId = args[2];
+      var offset = args[3];
+      var length = args[4];
+      var onSuccessCallback = function(data, hasNext) {
+        fileSystemProviderInternal.readFileRequestedSuccess(
+            fileSystemId, requestId);
+      };
+      var onErrorCallback = function(error) {
+        fileSystemProviderInternal.readFileRequestedError(
+          fileSystemId, requestId, error);
+      }
+      dispatch([fileSystemId, filePath, mode, create, onSuccessCallback,
+                onErrorCallback]);
+    });
+
 exports.binding = binding.generate();