[fsp] Add support for copying files within a provided file system.

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 7d4fd0184dcd68e70f12df79e13c52153ae6f6c7..1656e5ac4d776e09a88b9bc74353d9925c1ce354 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -132,6 +132,14 @@ namespace fileSystemProvider {
     DOMString filePath;
   };
 
+  // Options for the <code>onCopyEntryRequested()</code> event.
+  dictionary CopyEntryRequestedOptions {
+    DOMString fileSystemId;
+    long requestId;
+    DOMString sourcePath;
+    DOMString targetPath;
+  };
+
   // Callback to receive the result of mount() function.
   callback MountCallback = void([nodoc, instanceOf=DOMError] object error);
 
@@ -265,6 +273,13 @@ namespace fileSystemProvider {
         CreateFileRequestedOptions options,
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);
+
+    // Raised when copying an entry (recursively if a directory) is requested.
+    // If an error occurs, then <code>errorCallback</code> must be called.
+    [maxListeners=1, nodoc] static void onCopyEntryRequested(
+        CopyEntryRequestedOptions options,
+        ProviderSuccessCallback successCallback,
+        ProviderErrorCallback errorCallback);
   };
 };