[fsp] Add support for creating 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 75eddda1794e6e27663125f27ada1a124a058e8d..9334f37bb5e315a529824f2300dff98026c3f3a4 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -126,6 +126,13 @@ namespace fileSystemProvider {
     boolean recursive;
   };
 
+  // Options for the <code>onCreateFileRequested()</code> event.
+  dictionary CreateFileRequestedOptions {
+    DOMString fileSystemId;
+    long requestId;
+    DOMString filePath;
+  };
+
   // Callback to receive the result of mount() function.
   callback MountCallback = void([nodoc, instanceOf=DOMError] object error);
 
@@ -251,6 +258,14 @@ namespace fileSystemProvider {
         DeleteEntryRequestedOptions options,
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);
+
+    // Raised when creating a file is requested. If the file already exists,
+    // then <code>errorCallback</code> must be called with the <code>EXISTS
+    // </code> error code.
+    [maxListeners=1, nodoc] static void onCreateFileRequested(
+        CreateFileRequestedOptions options,
+        ProviderSuccessCallback successCallback,
+        ProviderErrorCallback errorCallback);
   };
 };